Cognitive science has a clear answer on the best use of a revision hour — and it is not reading the chapter again.
The illusion of fluency
Re-reading a chapter feels productive because the material seems familiar. But familiarity is not recall. In the exam hall nobody hands you the page to recognise — you must produce the answer from a blank sheet. Recognition and recall are different muscles, and re-reading trains only the weaker one.
The testing effect
Decades of studies agree: attempting to retrieve information strengthens memory far more than re-exposure to it. One landmark result found students who tested themselves retained roughly 50% more a week later than students who re-read for the same time. Wrong answers help too — a corrected mistake is remembered better than a fact never tested.
How to use this tomorrow
- Finish a chapter once, normally.
- Close the book and take a fresh question paper on that chapter — 7Marks generates one with an answer key in seconds.
- Mark yourself. Every red mark is a precise map of what to restudy.
- Restudy only the gaps, then take a second, different paper two days later.
Space it out
The second multiplier is spacing: test on day 1, day 3, day 7, day 21. Each successful recall at a longer gap roughly doubles how long the memory lasts. A little practice, spread out, beats a heroic single night every time.
The practical summary
Read once, test many times. Your marks come from retrieval, so spend your hours where the marks are.