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10 Best Study Methods for Exams in 2025

Discover the 10 best study methods for exams to boost retention and ace your tests. Learn actionable techniques like Spaced Repetition and Active Recall.

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Exam season often brings a familiar wave of stress, late-night cramming, and the hope that information will magically stick. But what if there was a better way? The difference between acing your exams and just scraping by isn't about studying harder; it's about studying smarter. Cognitive science has revealed powerful, evidence-based techniques that can transform your learning process, boost long-term retention, and reduce anxiety. This guide moves beyond generic advice like "study more" and dives into the 10 best study methods for exams, complete with actionable insights.

Throughout my own student journey, I learned that passively re-reading notes was a recipe for burnout and disappointing grades. I remember staring at my highlighted biology textbook for hours, only to blank out on the exam. It was only when I started actively engaging with the material—turning chapter headings into questions and forcing myself to answer them without peeking—that I saw a real difference. This article is the blueprint I wish I had.

We'll explore how to implement these powerful strategies effectively, including how tools like PDFFlashcards for Notion can streamline your workflow, turning dense textbooks into dynamic learning assets. Forget cramming. Get ready to revolutionize your study habits, build a system that works for you, and walk into your next exam with genuine confidence.

1. Spaced Repetition

Spaced repetition is a learning technique that involves reviewing information at increasing intervals over time to fight the forgetting curve. This approach uses the spacing effect so you review material just before you would naturally forget it, making each review session incredibly efficient.

Spaced Repetition

Explanation

Instead of cramming, spaced repetition schedules reviews based on how well you know something. A concept you struggle with appears more often, while a concept you've mastered appears less frequently. This optimizes your study time by focusing your effort where it's needed most.

Implementation Examples

  • Practical Example: A language learner studying Spanish creates a flashcard for "la mesa" (the table). After getting it right, the app schedules the next review for two days later. After getting it right again, it might be four days, then ten, and so on. If they get it wrong, the interval shortens.
  • Medical students use Anki decks in Notion to drill anatomy terms.
  • Bar exam candidates layer precedent cards by topic to track mastery.

Actionable Tips

  • Start early: This method's power comes from time. You can't space out repetition if you start the night before the exam.
  • Use digital tools: Apps like Anki or Quizlet automate the scheduling, so you don't have to track intervals manually.
  • Keep cards simple: Create flashcards with one question and one answer. For example, instead of "Describe photosynthesis," use "What are the inputs of photosynthesis?"
  • Review daily: Consistency is key. Dedicate 15-20 minutes each day to clear your review queue. Missing a day disrupts the algorithm.
  • Understand before memorizing: Don't just make a flashcard for a term you don't understand. First, grasp the concept, then create the card to cement it.

When and Why to Use

Choose spaced repetition for dense material you need to retain long-term. It excels in cumulative subjects such as language, law, and medical studies where repeated exposure cements foundational knowledge. It turns memorization from a chore into a manageable, systematic process.

Learn more about Spaced Repetition on pdfflashcards.com

2. Active Recall

Active recall is a highly effective study method that forces your brain to retrieve information from memory, rather than passively reviewing it. This process of pulling out knowledge strengthens neural pathways, making information stick and revealing exactly what you don't know yet.

Active Recall

Explanation

Instead of rereading notes or textbooks, active recall involves self-testing. It’s the difference between looking at a map of a city (passive review) and trying to navigate from one point to another without the map (active recall). The latter is harder, but it’s what actually builds memory.

Implementation Examples

  • Practical Example: After reading a chapter on the causes of World War I, close the book and write down the main causes (M.A.I.N. - Militarism, Alliances, Imperialism, Nationalism) and a brief explanation for each from memory. Then, open the book to check your accuracy and fill in any gaps.
  • History students explain the causes of major historical events aloud as if giving a lecture.
  • Math students solve problem sets on a blank sheet of paper, only referencing formulas they can recall.

Actionable Tips

  • Close the book: After reading a section, close the book and summarize it aloud or on a blank piece of paper.
  • Use practice questions: Utilize end-of-chapter questions, or even better, create your own in a Notion toggle list to quiz yourself.
  • Teach the material: Explain a concept to a friend, family member, or even your pet. If you can't explain it simply, you don't understand it well enough.
  • Leverage the Feynman Technique: A structured way to "teach" a concept to identify gaps in your knowledge.
  • Transform notes into questions: Go through your notes and rephrase statements into questions. Instead of "Mitochondria is the powerhouse of the cell," write "What is the function of mitochondria?"

When and Why to Use

Use active recall for any subject that requires deep understanding and recall, not just rote memorization. It is one of the best study methods for exams because it directly trains the skill being tested: retrieving information under pressure. It's especially powerful for conceptual subjects like physics, economics, and philosophy.

Learn more about the Feynman Technique for studying on pdfflashcards.com

3. Pomodoro Technique

The Pomodoro Technique is a time management method that breaks down study sessions into focused, 25-minute intervals separated by short breaks. This cyclical approach helps maintain high levels of concentration, prevents mental burnout, and makes daunting study tasks feel more manageable.

This process flow infographic visualizes the standard Pomodoro cycle.

Infographic showing key data about Pomodoro Technique

By alternating between intense focus and deliberate rest, you train your brain to work efficiently within set time constraints, making it one of the best study methods for exams.

Explanation

Developed by Francesco Cirillo, the technique uses a timer to create 25-minute work sprints called 'pomodoros'. During this time, you focus on a single task. When the timer rings, you take a five-minute break. After four pomodoros, you take a longer 15-30 minute break. The goal is total focus during the sprint.

Implementation Examples

  • Practical Example: A law student has to read a 50-page, dense case brief. The task feels overwhelming. They set a timer for 25 minutes and tell themselves, "I only have to read with full focus for 25 minutes." When the timer goes off, they get up, stretch, and grab a glass of water for 5 minutes. They repeat this four times and suddenly the daunting task is done.
  • Graduate students working on dissertations use the method to ensure consistent daily progress on their research and writing.
  • Anyone struggling with procrastination can use a single 25-minute session as a low-barrier way to just get started.

Actionable Tips

  • Use a physical timer: A simple kitchen timer is often better than your phone, which is full of potential distractions.
  • Protect your Pomodoro: If a distraction pops up (an idea, something you need to do), jot it down on a piece of paper and return to your task immediately.
  • Truly disconnect during breaks: Don't just switch to social media. Step away from your desk, stretch, look out the window, or walk around. This gives your brain a real rest.
  • Plan your pomodoros: Before you start, list the specific tasks you'll tackle in each session. This eliminates decision-making during your focus time.
  • Adjust intervals if needed: The 25/5 split is a starting point. Some find 50-minute focus blocks with 10-minute breaks more effective. Experiment to find your rhythm.

When and Why to Use

Employ the Pomodoro Technique when you need to sustain focus over long study periods or when you feel overwhelmed by a large workload. It is exceptionally effective for combating procrastination and building study endurance, as the short, timed bursts make it easier to start and continue working.

Learn more about time management apps for students

4. Feynman Technique

The Feynman Technique is a mental model for learning that involves explaining a complex concept in simple, plain language as if you were teaching it to a child. This process, named after Nobel laureate physicist Richard Feynman, quickly reveals gaps in your understanding and forces you to move beyond surface-level memorization to achieve true comprehension.

Explanation

The technique operates on a simple four-step process: 1) Choose a concept. 2) Teach it to a toddler (or imagine doing so). 3) Identify your knowledge gaps when you get stuck or use jargon. 4) Go back to the source material to fill those gaps, then simplify your explanation again.

Implementation Examples

  • Practical Example: I used this when I was struggling with the concept of 'inflation' in economics. I tried to explain it to my younger brother. I started, "Inflation is when the general price level of goods and services rises..." He looked at me blankly. I realized I was just reciting a definition. I had to go back and understand the why. My next attempt was, "Imagine you have $1 and can buy a candy bar. Next year, you still have $1, but that same candy bar costs $1.10. Your dollar buys less than it used to. That's inflation." That's when I knew I really understood it.
  • Computer science students explain algorithms like quicksort using a deck of cards as an analogy.
  • Medical students simplify intricate disease mechanisms for a patient, avoiding technical jargon.

Actionable Tips

  • Use analogies: Connect abstract ideas to concrete, everyday things. For example, explain an electrical circuit using the analogy of a water plumbing system.
  • Write it down: Literally write or type out your simple explanation. This forces clarity.
  • Say it out loud: The act of speaking engages different parts of your brain and makes it obvious where your explanation is clunky or confusing.
  • Focus on the 'why': Don't just state a fact. Explain why it's true. Why does this formula work? Why did this historical event happen?
  • Review and refine: After filling your knowledge gaps, try the simple explanation again. Repeat until it's smooth and clear.

When and Why to Use

This is one of the best study methods for exams focused on conceptual understanding rather than rote memorization. Use it for complex subjects in science, philosophy, or economics where you must deeply understand foundational principles to solve problems.

Learn more about the Feynman Technique on Farnam Street

5. Mind Mapping

Mind mapping is a visual learning technique that represents information hierarchically. It starts with a central topic, with related subtopics branching outward to mirror how the brain naturally organizes and connects information, making it one of the best study methods for exams involving complex subjects.

Mind Mapping

Explanation

This technique uses a radial structure, colors, images, and spatial relationships to make information easier to digest and remember. By visually linking concepts, you create a powerful mental framework that enhances comprehension and recall far better than linear, text-based notes.

Implementation Examples

  • Practical Example: To prepare for an essay on Shakespeare's Macbeth, a student places "Macbeth" at the center. Main branches could be "Themes," "Characters," and "Plot." From "Themes," smaller branches for "Ambition," "Guilt," and "Fate" emerge. From "Ambition," they add key quotes or plot points as evidence. The entire play is now visible on one page.
  • Biology students create a map of the nervous system, branching from the brain to individual nerves.
  • History students connect the causes, key events, and long-term effects of a war.

Actionable Tips

  • Start with a central image: An image is more memorable than a word. For a map on Photosynthesis, you could draw a simple sun or plant in the middle.
  • Use single keywords: Place one key word or a very short phrase on each branch. This encourages concise thinking and leaves more room for connections.
  • Employ different colors: Use a unique color for each major branch and its sub-branches. This helps visually group related ideas.
  • Include images and symbols: A small drawing of a crown next to "Kingship" is much more memorable than the word alone.
  • Use curved lines: Organic, curved branches are more visually stimulating and less rigid than straight lines.

When and Why to Use

Use mind mapping when you need to understand the "big picture" and the relationships between different concepts. It is ideal for brainstorming essays, summarizing complex topics, or breaking down a large subject into manageable parts before diving into detailed study.

6. Cornell Note-Taking System

The Cornell Note-Taking System is a systematic format for organizing notes into a structure that facilitates active learning and efficient review. It divides a page into a main notes column, a narrower cue column for questions or keywords, and a bottom section for a concise summary.

Explanation

This method transforms note-taking from a passive transcription exercise into an active process. By segmenting your page, you create a built-in study guide. The main section captures lecture content, the cue column prompts active recall, and the summary solidifies understanding. This is one of the best study methods for exams because it organizes information for easy review.

Implementation Examples

  • Practical Example: During a psychology lecture on conditioning, a student takes notes in the main column. That evening, they review the notes and write questions in the cue column like, "What's the difference between classical and operant conditioning?" and "Who was Pavlov?" Before the next class, they cover the main notes and try to answer these questions, instantly performing active recall.
  • Professionals attending development seminars use the cue column to jot down action items or follow-up questions.
  • Students preparing for comprehensive exams use the summary section of each page to create a master outline.

Actionable Tips

  • Review and question promptly: Fill in the cue column with questions or main ideas within 24 hours of the lecture, while the material is still fresh.
  • Use shorthand: Develop your own set of abbreviations and symbols to take notes faster without sacrificing detail. (e.g., w/ for with, b/c for because).
  • Test yourself: Regularly cover the main notes section and try to answer the questions in your cue column from memory. This is active recall built right into your notes.
  • Summarize concisely: At the end of each page, force yourself to write a one or two-sentence summary of the material. This tests your understanding of the main point.
  • Focus on main ideas: Don't try to write down every single word the professor says. Listen for key concepts, examples, and conclusions.

When and Why to Use

Use the Cornell Note-Taking System for lecture-based classes or meetings where you need to process and organize information in real-time. It is exceptionally effective for turning passive listening into an active learning session and creating a structured, review-ready study tool from the start.

Learn more about how to organize your notes on pdfflashcards.com

7. Practice Testing

Practice testing is a powerful study method where you actively simulate the real exam experience. It goes beyond passively reviewing notes by forcing your brain to retrieve information under pressure, a process known as active recall, which significantly strengthens memory and exposes knowledge gaps.

Explanation

This technique involves answering questions or solving problems from memory, mimicking the cognitive demands of an actual test. By regularly engaging in low-stakes practice exams, you build familiarity with the format, timing, and types of questions, which helps reduce test-day anxiety and improves performance.

Implementation Examples

  • Practical Example: A student preparing for the SAT doesn't just study vocabulary lists. Every Saturday morning, they set a timer, put their phone in another room, and complete a full, timed practice section under exam conditions. Afterward, they spend hours reviewing every single question—right or wrong—to understand their mistakes.
  • Medical students work through thousands of USMLE-style questions in dedicated question banks (Qbanks).
  • CPA candidates complete entire mock exams provided by their review courses.

Actionable Tips

  • Simulate real conditions: This is crucial. Find a quiet space, set a strict timer, and follow the exam rules. No music, no phone, no extra breaks.
  • Analyze your errors: Review every question, especially the ones you got wrong. Don't just look at the right answer. Understand why your answer was wrong and why the correct answer is right.
  • Create a "wrong answer journal": In a notebook or a Notion database, log every question you get wrong. Write down the topic, why you missed it (e.g., misread question, content gap, careless error), and the correct concept. Review this journal regularly.
  • Start with low stakes: At the beginning of a semester, use practice questions that are not timed. As the exam gets closer, shift to timed, full-length tests.
  • Mix up topics: Use practice tests that cover multiple chapters to simulate the randomness of a real final exam. This combines practice testing with interleaving.

When and Why to Use

Use practice testing after you have a foundational understanding of the material. It is one of the best study methods for exams with a standardized format or problem-solving focus, such as entrance exams (MCAT, LSAT), professional certifications (PMP, CFA), and final exams in STEM fields.

8. SQ3R Method

The SQ3R Method is a comprehensive reading strategy designed to improve understanding and retention of dense written material. This five-step process stands for Survey, Question, Read, Recite, and Review, guiding you to actively engage with your textbooks instead of passively reading them.

Explanation

Developed by Francis Pleasant Robinson, SQ3R turns reading into a deliberate, active process. You start by surveying the chapter to get the big picture, then formulate questions. You read specifically to find answers, recite what you've learned, and finally review it all to solidify your knowledge.

Implementation Examples

  • Practical Example: A sociology student has a chapter titled "Social Stratification." Survey: They skim headings, look at graphs, and read the summary. Question: They turn headings like "Theories of Stratification" into "What are the main theories of stratification?" Read: They read the section specifically looking for the answers. Recite: After reading about Conflict Theory, they close the book and explain it in their own words. Review: The next day, they glance over their questions and try to answer them again.
  • Graduate students reviewing research literature apply the method to quickly grasp the core arguments of dense academic papers.
  • A biology student can turn a chapter title like "Cellular Respiration" into questions like "What are the stages?" and "Where does each occur?"

Actionable Tips

  • Don't skip the survey: Spending 5 minutes skimming headings, summaries, and images first gives your brain a mental map to place the new information.
  • Write your questions down: Before reading, physically write out the questions you form from chapter headings. This makes your reading an active hunt for answers.
  • Read with a purpose: Your goal is no longer to just "get through the chapter." Your goal is to find the answers to your specific questions.
  • Recite aloud: After each section, pause and summarize the key points out loud in your own words. This is a mini-Feynman Technique and powerful for retention.
  • Schedule reviews: The "Review" step isn't just a one-time thing. Briefly review your notes and questions from the chapter the next day, and again a week later.

When and Why to Use

This is one of the best study methods for exams involving dense, information-heavy textbooks, like those in history, sociology, or science. Use SQ3R when you need to extract and retain specific information from readings, as it forces deep processing rather than surface-level skimming.

Learn more about The SQ3R Reading Method on effective-study.com

9. Interleaving

Interleaving is a study technique where you mix different topics or problem types within a single study session instead of practicing one concept at a time (blocked practice). This method forces your brain to work harder to identify and apply the correct solution, which strengthens long-term retention.

Explanation

Instead of mastering Topic A before moving to Topic B (blocked practice), interleaving involves doing a problem from A, then B, then C, then back to A. This initial struggle helps you better discriminate between concepts, making it one of the best study methods for exams that test a wide range of material.

Implementation Examples

  • Practical Example: A math student is studying different types of integration. Instead of doing 20 problems of one type, then 20 of another, they use a problem set that mixes them all up. For each problem, they first have to ask, "Which technique do I even use here?" This is harder, but it perfectly mimics the exam experience.
  • Language learners might alternate between grammar drills (e.g., past tense), vocabulary flashcards, and conversation practice in a single hour.
  • A music student might practice scales for 10 minutes, then work on a difficult piece for 10 minutes, followed by 10 minutes of sight-reading.

Actionable Tips

  • Master the basics first: Interleaving isn't effective if you don't have a foundational grasp of each topic. Learn Topic A and Topic B individually before you start mixing them.
  • Plan your mix: Don't just randomly jump around. Plan a study session to include, for example, 3 problems from Chapter 5, 3 from Chapter 6, and 3 from Chapter 7.
  • Embrace the struggle: It will feel harder and less productive than blocked practice. You will feel slower. This is a sign that it's working. The desirable difficulty is what leads to better long-term learning.
  • Mix related concepts: Interleaving is most powerful when you mix up similar concepts that are easy to confuse, like different statistical tests or similar-sounding historical figures.
  • Combine with Spaced Repetition: After an interleaved practice session, you can space out your next session that covers those same topics.

When and Why to Use

Use interleaving when preparing for comprehensive exams that require you to apply different problem-solving skills on the fly. It is especially powerful for subjects like mathematics and science where you must choose the right formula or procedure from many options.

10. Elaborative Interrogation

Elaborative interrogation is a powerful study technique that involves generating explanations for facts by repeatedly asking "why" they are true. Instead of passively absorbing information, you actively probe its underlying causes and connections, building a deeper, more integrated understanding of the material.

Explanation

This technique forces you to process information at a deeper level. By asking why a concept works or how it connects to something you already know, you create more elaborate and meaningful memory traces. This active questioning helps integrate new knowledge into your existing mental frameworks, making it easier to recall during exams.

Implementation Examples

  • Practical Example: When studying that "democracies are less likely to go to war with each other," a student doesn't just memorize the fact. They ask, "Why?" They might reason: "Because their leaders are accountable to the public, who bear the costs of war," or "Because they share common norms of conflict resolution." This explanation is what they'll remember.
  • Science students question why a particular chemical reaction produces a certain byproduct, linking it to principles of molecular stability.
  • Psychology students explore why a cognitive bias occurs, connecting it to evolutionary survival mechanisms or information processing shortcuts.

Actionable Tips

  • Be the annoying toddler: For every major fact or concept, repeatedly ask "Why?" until you reach the foundational principle.
  • Connect new to old: Actively ask, "How does this relate to what I learned last week?" or "How is this concept similar to/different from that other one?"
  • Explain it to someone else: Articulating the "why" to a study partner forces you to structure your reasoning logically.
  • Look for cause-and-effect: Frame your studying around identifying causal chains. If X happened, what caused it? What were its effects?
  • Don't settle for surface answers: If the book says a policy was enacted, dig deeper. Why then? What problem was it trying to solve? Who benefited?

When and Why to Use

Use elaborative interrogation for conceptual subjects like history, psychology, biology, and economics, where understanding relationships is more important than rote memorization. It is one of the best study methods for exams that require critical thinking and application of knowledge, as it trains your brain to think analytically rather than just recalling isolated facts.

Top 10 Study Methods Comparison

Method Implementation Complexity 🔄 Resource Requirements ⚡ Expected Outcomes 📊 Ideal Use Cases 💡 Key Advantages ⭐
Spaced Repetition Moderate - requires consistent daily setup and practice Digital tools like Anki or Quizlet recommended Maximizes long-term retention, efficient memorization Memorizing facts, vocabulary, formulas Backed by cognitive science, prevents cramming
Active Recall High - needs mental discipline and question creation Minimal; self-testing materials suffices Strongly improves retention, identifies knowledge gaps Exam prep, practice under pressure Builds confidence, efficient retrieval practice
Pomodoro Technique Low - easy timer setup, simple intervals Timer or app; physical timers preferred Maintains focus, prevents burnout Time management, combats procrastination Enhances concentration, manageable study chunks
Feynman Technique Moderate to High - involves explanation and refinement Minimal, but may need peers/audience Deep conceptual understanding Complex concepts, teaching others Reveals gaps, improves communication
Mind Mapping Moderate - requires practice for effective creation Pens/paper or digital apps preferred Enhanced comprehension, creativity Visual learners, organizing hierarchical info Engages visual memory, shows relationships
Cornell Note-Taking Moderate - requires structured format adherence Note-taking materials Organized info, active engagement Lecture-heavy courses, verbal info organization Facilitates review, systematic note structure
Practice Testing High - requires quality practice materials and timing Access to practice tests or question banks Improved exam familiarity, reduces anxiety Standardized tests, professional certifications Realistic test practice, time management
SQ3R Method High - multi-step, time-intensive reading strategy Textbooks or reading materials Better comprehension and retention Dense textbooks, academic reading Systematic reading, natural review checkpoints
Interleaving High - needs careful planning and material mixing Diverse study materials Stronger long-term retention, flexible thinking Mixed subject exams, problem-solving Prevents overlearning, improves concept discrimination
Elaborative Interrogation Moderate to High - requires thoughtful questioning Sufficient prior knowledge needed Deeper understanding, better transfer Subjects with causal relationships (history, science) Builds critical thinking, meaningful learning

Putting It All Together: Your Personalized Study System

Navigating the path to academic success can feel like trying to find your way through a dense forest. We've explored a comprehensive map of ten powerful, evidence-based study techniques, from Active Recall and Spaced Repetition to the Feynman Technique and Mind Mapping. Each method represents a distinct trail you can take. However, the true secret isn't just knowing the trails; it's about learning how to combine them into a personalized superhighway for learning. The best study methods for exams are not a rigid prescription but a flexible toolkit, ready for you to customize.

The common thread weaving through all these strategies is the shift from passive learning to active engagement. Gone are the days of simply re-reading highlighted notes and hoping for the best. True comprehension and long-term retention are built by actively wrestling with the material, forcing your brain to retrieve information, explain it in your own words, and connect it to what you already know.

From Theory to Action: Building Your Study Engine

Think of these methods as interconnected gears in a powerful study engine. A single gear is useful, but when they work together, they generate unstoppable momentum. Your task now is to become the chief engineer of your own learning process.

Here’s a practical example of how you can combine these techniques for a single subject, like a biology course:

  • During Lectures: Use the Cornell Note-Taking System to capture key concepts, trigger questions, and write a summary of each session. This immediately forces you to process the information.
  • Post-Lecture Review (Within 24 Hours): Take your Cornell notes and apply the Feynman Technique. Try to explain a complex process like cellular respiration to an imaginary five-year-old. This will instantly reveal your knowledge gaps.
  • Creating Study Assets: Transform your refined notes and textbook chapters into study tools. Use a tool like PDFFlashcards to quickly generate digital flashcards from your PDF lecture slides, focusing on the questions from your Cornell notes. This is a direct application of Active Recall.
  • Daily Study Sessions: Manage your time with the Pomodoro Technique. During your focused 25-minute blocks, use your newly created flashcards. The schedule for which flashcards you review will be dictated by a Spaced Repetition system, ensuring you see difficult concepts more frequently.
  • Weekly Review: Dedicate one session a week to Practice Testing. Use old exam papers or questions from the back of your textbook to simulate exam conditions, reinforcing your knowledge and building your confidence.

Your Next Step: The Experiment of One

The journey to finding the best study methods for exams that work for you is an experiment of one. There is no magic bullet, only what you consistently and effectively apply. Don't feel overwhelmed by the need to implement all ten methods at once. The goal is progress, not perfection.

Start small. This week, choose just two techniques from the list. Perhaps you’ll try the Pomodoro Technique to manage your time and pair it with creating flashcards for Active Recall. Observe how it feels. Does it make your study sessions more focused? Do you feel you’re retaining more information? Based on your experience, you can keep, discard, or modify the approach. By embracing this mindset of experimentation and continuous improvement, you're not just studying for your next exam; you’re building a powerful, lifelong skill. You are learning how to learn.


Ready to supercharge your study sessions? Streamline the process of creating flashcards from your lecture notes and textbooks with PDFFlashcards. Stop wasting time manually typing and start practicing Active Recall and Spaced Repetition in minutes. Give your study system the upgrade it deserves at PDFFlashcards.