Active Recall vs Rereading: Which Should You Use?

Rereading means going back over your notes, slides or textbook. Active recall means closing them and trying to retrieve the information yourself — answering a question, writing out a process, explaining a concept — and only then checking.

Both use the same material. The difference is what your brain is doing. When you reread, the information arrives from the page. When you recall, you have to produce it, and that effort strengthens your ability to produce it again later. Producing answers is exactly what an exam asks of you.

Retrieval practice is one of the more consistently supported findings in learning research. In a well-known study, Roediger and Karpicke (2006) had students either restudy a passage or practice recalling it. Restudying did slightly better on a test a few minutes later, but the students who practiced retrieval remembered more when tested days later.

Broader reviews of study techniques, such as Dunlosky and colleagues (2013), rated practice testing and spaced (distributed) practice among the more useful strategies and rated rereading as relatively low in usefulness. That doesn't mean rereading does nothing — it means that, hour for hour, it tends to be the weaker choice.

Results vary by subject, student and test format, so treat this as a strong default rather than a rule that holds in every case.

Rereading's biggest problem is that it feels productive. The second time through a chapter, everything is familiar, and that familiarity is easy to mistake for understanding. This is often called the fluency illusion, or an illusion of competence.

Active recall gives you the opposite experience. It feels slow, and you notice everything you can't remember. That discomfort is useful: it shows you exactly where your gaps are, while rereading tends to hide them. It's also why judging your preparation by feel is risky — here's how to check whether you're actually ready.

Here's how the two methods differ in practice:

Rereading isn't useless — it's just the wrong tool for most of exam prep. It earns its place in a few situations:

You don't need a whole new system. Change what you do with the notes you already have. If you have an exam coming up, this week-long midterm schedule built around recall puts these steps into a plan.

The main cost of active recall is writing the questions. TurboStudy generates them from your own course material: upload slides, PDFs, Word docs or photos of handwritten notes, and you can get multiple-choice quizzes with explanations, editable flashcards with spaced-repetition review, and — on Standard and Pro — open-ended questions you answer in your own words with AI feedback. Questions you miss are saved by concept so you can retry them later.

It removes the setup work, not the effort of recalling — that part is still yours, and it's the part that matters. AI can make mistakes, so check any surprising answer against your notes.