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Spaced repetition, active recall, and why cramming feels productive but isn't.
Most people study by rereading — highlighting a textbook, rereading notes, watching a lecture a second time. It feels productive because the material feels familiar. That familiarity is the trap: recognizing something is not the same as being able to retrieve it cold, on an exam, three weeks later.
Two techniques consistently outperform rereading in controlled studies: active recall and spaced repetition.
Active recall means testing yourself before you feel ready, not after. Close the book and try to write down everything you remember about a topic, then check what you missed. The struggle to retrieve information is what strengthens the memory — not the act of re-reading it.
Spaced repetition means reviewing material at increasing intervals — a day later, then a week, then a month — rather than in one long session. Each review should happen right around when you're about to forget, which is uncomfortable but far more effective than back-to-back repetition.
CoStudy's flashcards are built around both: every card is a retrieval attempt, and progress tracking naturally resurfaces cards you haven't seen in a while.
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