Ask most students how they study for an exam and you’ll hear some version of the same answer: re-read the chapter, highlight the important parts, maybe rewrite the notes once for good measure. It feels productive. It’s also one of the least effective ways to study that cognitive scientists have ever tested.
The study techniques for exams that actually move test scores are active recall and spaced repetition, not re-reading or highlighting — a finding that’s been replicated across dozens of studies comparing how students perform after different study methods. This post breaks down what the research actually says works, what doesn’t, and how to build an exam study plan around the techniques that hold up.
Why Re-Reading Feels Productive but Isn’t
Re-reading and highlighting create a specific illusion: the material feels familiar, so it feels learned. But familiarity and retrieval are different skills. You can recognize a fact as true the moment you see it again and still be completely unable to produce it from memory on a blank exam page — which is exactly the gap re-reading never closes.
A landmark 2013 review of ten common study techniques, published in Psychological Science, rated highlighting and re-reading as low utility and testing yourself as high utility. The gap wasn’t small. Students who tested themselves during study outperformed re-readers on delayed exams by a wide margin, even when both groups spent the same amount of time studying.
Active Recall: Testing Yourself Instead of Reviewing Notes
Active recall means closing the book and trying to produce the answer from memory, then checking yourself — the opposite of scanning notes and nodding along. It’s harder in the moment, which is exactly why it works: the effort of retrieval is what strengthens the memory trace, a phenomenon researchers call the testing effect.
Ways to build active recall into exam prep:
- Flashcards, where you must produce the answer before flipping the card — not just read both sides in sequence
- Practice questions from past exams or textbook problem sets, done closed-book
- The blank-page method: write down everything you remember about a topic from memory, then compare against your notes to find the gaps
- Teaching it out loud to someone else, or even to an empty room — you can’t fake explaining something you don’t understand
Read more on the technique itself in our active recall guide.
Spaced Repetition: Timing Your Reviews
Active recall tells you how to study a fact; spaced repetition tells you when. Cramming the night before packs everything into a single session, which produces short-term recognition but fast forgetting — the classic forgetting curve that Hermann Ebbinghaus documented over a century ago.
Spreading the same amount of study time across several sessions, with growing gaps between them, produces dramatically better retention on exam day than cramming the same material into one sitting.
| Approach | Effort | Exam-day retention |
|---|---|---|
| Cram the night before | High, once | Fades within days |
| Re-read chapter 3 times | Moderate, repeated | Familiar but weak recall |
| Spaced, active recall sessions | Spread over weeks | Strong, durable recall |
Building an Exam Study Plan Around What Works
Put together, active recall and spaced repetition suggest a fairly different weekly rhythm than most students default to:
- Start recall practice early — the first pass at a topic should include a self-test, not just a read-through
- Space sessions across days, not hours — three 20-minute sessions across a week beat one hour-long cram
- Mix old and new material in every session, so earlier topics don’t quietly decay while you focus on what’s newest
- Track which topics you keep missing and weight review time toward those, rather than reviewing everything equally
This is also where chunking helps on dense material — see our guide on chunking for memory for breaking large topics into groups small enough to actually hold onto.
Getting Started
- Convert your notes into questions, not summaries — every topic should have a question you can quiz yourself on.
- Schedule three short review sessions per topic spread across the week instead of one long session the night before.
- Self-test before every review, checking your answer only after you’ve committed to one.
- Load weak topics into a spaced-repetition system so they resurface right before you’d otherwise forget them.
The single biggest lever in exam prep is switching from re-reading to self-testing on a spaced schedule — everything else is a refinement on top of that. Memwiz builds both pieces in: SM-2 spaced-repetition flashcards handle the timing automatically, and the AI deck generator turns a topic straight into a ready-to-study set of question-and-answer cards. It’s a one-time $7.99 on iPhone and iPad, no subscription.