Forgetting is normal, and predictable
Hermann Ebbinghaus, working in the late nineteenth century, showed that memory for newly learned material decays sharply within the first days and then more slowly. The practical implication is uncomfortable but useful: a chapter read once and never revisited is largely unavailable within a week, no matter how well it felt understood at the time.
Because the decay is predictable, it can be countered on a schedule. Each time material is recalled just as it begins to fade, the rate of subsequent forgetting slows. This is the entire idea behind spaced repetition.
A schedule you can actually keep
Elaborate software is not required. A notebook and a calendar are sufficient for most examination preparation.
- Revision 1: same day, roughly eight hours after first study
- Revision 2: after three days
- Revision 3: after one week
- Revision 4: after three weeks
- Revision 5: after two months, then monthly until the examination
Recall first, re-read second
A revision session should begin with a closed book. Write down everything you remember about the topic, then open the material and correct what you missed. This feels harder than re-reading — and that difficulty is precisely what strengthens the memory. Passive re-reading produces a strong feeling of familiarity and a weak ability to reproduce facts under pressure.
Attempting a short quiz serves the same function and has the advantage of matching the format of the examination itself, so it also rehearses option elimination and time discipline.
What to space, and what not to
Spaced repetition is most effective for discrete facts: dates, definitions, names, formulae, constitutional articles, and vocabulary. It is less useful for skills such as reading comprehension or multi-step arithmetic, which improve mainly through volume of varied practice.
The efficient combination for most aspirants is therefore spaced repetition for the memorisation-heavy sections and daily varied practice for the skill-heavy ones. Applying the wrong method to the wrong subject is one of the most common reasons preparation stalls despite long study hours.
Test what you just learned
Reading builds recognition — quizzes build recall. Attempt a free quiz now.