Highlighting is mostly useless. Re-reading is worse. Here are the 5 study techniques that actually predict higher test scores, proven by cognitive-science research and used by top-decile US college students.
1. Active recall, the #1 technique, period
Close your notes. Try to retrieve the information from memory. Check. Repeat. Active recall is 2-3x more effective than re-reading, according to meta-analyses in Psychological Science. The reason: retrieving information strengthens the memory trace; re-reading doesn't.
2. Spaced repetition, fight the forgetting curve
Hermann Ebbinghaus showed we forget 70% of new information within 24 hours unless we revisit it. Spaced repetition systems (Anki, Quizlet) schedule reviews at increasing intervals so you re-encounter info just before you'd forget it. 20 minutes/day in Anki beats a 5-hour cram session, every time.
3. Interleaving, mix subjects instead of blocking
Counterintuitive but true: studying Chapter 3 of one subject, then Chapter 2 of another, then back to Chapter 4 of the first beats blocking each subject for hours. Interleaving forces your brain to retrieve which method/concept applies, exactly what tests demand.
4. The Feynman technique, teach to learn
Explain the concept out loud as if teaching a 12-year-old. When you stumble, you've found the gap. Go back to the source, fix it, try again. Used by physics Nobel laureate Richard Feynman, and now by top med-school students worldwide.
5. Sleep, the underrated multiplier
Sleep consolidates memories. A 2019 study in Nature Communications showed students who slept 7+ hours after studying remembered 40% more 48 hours later vs. those who pulled all-nighters. The all-nighter math doesn't work.
Key takeaways
- Active recall > re-reading (2-3x)
- Spaced repetition beats cramming
- Interleave subjects, don't block
- Feynman: teach to find your gaps
- Sleep = +40% memory consolidation