To study for an exam with spaced repetition, turn the syllabus into small question-and-answer cards, start reviewing as early as you can, and let the gaps between reviews grow as the exam gets closer. Spaced repetition is a study method that schedules each review shortly before you would forget the material, and spreading the same hours over weeks beats packing them into the last few days.
Key takeaways
- Start early. The benefit of spacing comes from the time between reviews, so a plan that starts three weeks out beats the same hours the night before.
- Make cards from the exam syllabus, not from everything you read. Cover what will be asked.
- Review a little every day. Short, frequent sessions are easier to sustain than rare marathons.
- Let a scheduler widen the gaps for you, and do not skip the cards that feel hard.
- In the last days, review what you keep missing, not the whole deck again.
Why spacing beats cramming for an exam
Cramming works for tomorrow and fades quickly. The spacing effect is the finding that spreading study over several sessions produces memory that lasts longer than the same study in one block. We cover the basics in what spaced repetition is and why it works. Distributed practice was also one of the two techniques rated high utility in a 2013 review of ten study techniques (Dunlosky et al.). Desired retention is the share of cards you want to recall when they come up, and it sets how often cards return. Spacing works against the forgetting curve, the fast early loss that cramming does not change.
For exam planning, one study is especially useful. Cepeda and colleagues taught more than 1,350 people a set of facts, gave them a review after gaps of up to 3.5 months, and tested them up to a year later. Their 2008 paper in Psychological Science (Spacing effects in learning: a temporal ridgeline of optimal retention) found that the best gap between study sessions depends on how long you need to remember. Measured as a share of that delay, the best gap fell from about 20 to 40 percent of a one-week delay to about 5 to 10 percent of a one-year delay.
Two practical points follow:
- If the exam is a month away, a new card's first review should not be "tomorrow and never again". Spread reviews across the weeks you have.
- The further away the exam, the smaller the fraction of that time you need between reviews. A scheduler does this arithmetic so you do not have to. If you prefer to do it by hand, the Leitner system is a simple box-based version.
A simple plan for the weeks before an exam
The table below is a practical template, not a research result. For example, in the middle weeks the work is mostly reviews, such as clearing the cards that are due each morning. It shows how the focus changes as the date approaches. Adjust it to your own timetable.
| Time to exam | What to do | Daily time |
|---|---|---|
| 4 weeks or more | Turn each topic into cards as you learn it. Review whatever is due. | 15 to 30 minutes of reviews, plus card writing |
| 2 to 3 weeks | Finish adding cards for the syllabus. Stop adding new material a week before the exam. | Reviews only, as many as are due |
| Final week | Fix cards you keep missing: rewrite vague ones, split big ones. | Reviews plus 10 minutes of card repair |
| Last 2 days | Review only what is due and the weakest cards. Sleep. | Short sessions |
Behind the table are five habits:
- Turn the syllabus into cards. For each topic, write cards that ask one small thing. How to write good flashcards covers the craft.
- Add cards as you learn, not at the end. A card made the day you first understand a topic starts its review clock that day.
- Review daily, briefly. A few minutes of due cards each day is better than a long weekly session. If you are unsure how many new cards to add, see how many flashcards to review per day.
- Set the target honestly. The closer the exam, the more it is worth keeping recall high on material you cannot afford to forget. Desired retention in FSRS explains the trade-off between workload and recall.
- Grade truthfully. An inflated grade pushes a card out too far. See how to grade your flashcard reviews honestly.
A worked example
For example, say you have 120 facts to learn for a three-week test. A workable pattern: add 10 to 15 new cards a day for the first nine days, then stop adding. By day ten you have the full set, and the scheduler is already bringing back the earliest cards at wider gaps. The final week is spent on the cards you missed, not on starting new topics. This example is an illustration of the planning logic, not a measured outcome.
What to do if you are late
If the exam is only a few days away, the spacing advantage is smaller, but a scheduled approach still beats re-reading. The reasons are covered in why rereading fails and practice testing works. Make cards for the highest-value topics only, review them several times a day with gaps of a few hours, and sleep. Do not add new topics the night before.
Using Cirello for exam prep
Cirello schedules reviews with FSRS-6 and shows only what is due that day, so the daily session stays proportionate. You can paste a list of terms in bulk, or point a card at a page of your textbook so you review from the source. Progress is counted weekly, so a busy exam week does not erase anything. See the pages for medical students and law students for examples of long, source-heavy material, or the flashcard app overview. If you want the schedule mechanics in more detail, read spaced repetition schedule: how often to review. The beta is free.
Written by the Cirello team; see about Cirello and how we write for our editorial approach. Questions or corrections? Contact us at [email protected] or through the support page.
Sources
- Dunlosky, J., Rawson, K. A., Marsh, E. J., Nathan, M. J., & Willingham, D. T. (2013). Improving students' learning with effective learning techniques. Psychological Science in the Public Interest, 14(1), 4-58. DOI
- Cepeda, N. J., Vul, E., Rohrer, D., Wixted, J. T., & Pashler, H. (2008). Spacing effects in learning: a temporal ridgeline of optimal retention. Psychological Science, 19(11), 1095-1102. PubMed