If you only change one thing about how you study, make it this: stop re-reading and start retrieving.
The forgetting curve
In the 1880s Hermann Ebbinghaus showed that we forget new material quickly at first and then more slowly. Without review, much of what you learned today is gone within days.
Active recall
Active recall means trying to bring information to mind without looking. Studies on the "testing effect" show that students who practise retrieving material remember far more a week later than students who simply re-read it. It feels harder, and that difficulty is what makes it work.
Spaced repetition
Spacing means reviewing just as you are about to forget. Each successful recall makes the gap before the next review longer. A common schedule:
- Review after 1 day.
- Again after 3 days.
- Again after 1 week.
- Again after 1 month.
Build a simple system
- After a lesson, write questions rather than summaries.
- Put each question on a card (paper or an app), answer on the back.
- Each day, go through the cards due, answering aloud before flipping.
- Move correct cards to longer gaps; send missed ones back to tomorrow.
- Keep cards small: one idea per card.
Where it works best
Vocabulary, dates, formulas, anatomy, law, medicine, programming syntax. For deeper subjects, combine recall with explaining the idea in your own words.
A daily habit makes the difference. Build one with the five-minute Daily Challenge.