Why a week is enough to space well
A week feels short, but it leaves room for three or four passes on each topic. That is what counts. A meta-analysis of 839 measures shows that spacing reviews beats massing them all at once (Cepeda et al., 2006). And the best gap depends on the date of the test. For an exam a week away, it is about 20 to 40% of the time left (Cepeda et al., 2008), so one to three days.
In practice, there are two traps to avoid. The first is keeping the last chapter for the night before, because it will only get one pass. The second is rereading the same pages every day, which feels like progress without ever testing your memory. The plan below does the opposite, everything is covered in the first three days, and the following days are for quizzing yourself.
The day by day plan
Split the syllabus into thirds. On days 1, 2 and 3, learn one third a day, and start each session with ten minutes of questions on the previous day’s third. On day 4, quiz yourself on the whole syllabus with chapters mixed together, which forces you to recognise what kind of question you are facing, as Does interleaving, or mixed practice, really help you study? explains.
On day 5, go back over the mistakes from day 4 only. On day 6, sit a mock exam in real conditions, with the real duration and without your notes. On day 7, the day before, keep a short session on the mistakes from the mock exam, then stop early. The table below sums up this rhythm. For a different deadline, the page Spaced repetition calculator, your review dates up to the exam works out the dates for you.
Quiz yourself rather than reread
Every pass in the plan is a question pass. In the study by Roediger and Karpicke, between a test 5 minutes later and a test a week later, students who had reread forgot 52% of what they knew, against 14% for those who had quizzed themselves (Roediger and Karpicke, 2006). A week is precisely the time you have before your exam.
Write your questions during days 1 to 3, one question per topic as you learn. On the following days you only need to go back to them. Answer from memory before checking, out loud or in writing. The page Active recall, why quizzing yourself beats rereading covers the method, and How to make flashcards that actually work shows how to write questions that make you produce the answer.
Sleep is part of the plan
Sleep after learning helps consolidate memories, which is the conclusion of the review by Rasch and Born on sleep’s role in memory (Rasch and Born, 2013). Over a week, that is seven nights of consolidation. Giving them up to win study hours means learning more and keeping less.
The night before, the pull of an all nighter is strong. The page Does cramming the night before an exam work? explains why cramming feels like it works, and what it costs a week later. If you struggle to stay awake in afternoon sessions, the page How to study without falling asleep or zoning out gives measured options, and Sleep and memory, why sleeping after you study matters covers the link between sleep and memory.
| Day | New material | Questions |
|---|---|---|
| Day 1 | Third A | End of session on A |
| Day 2 | Third B | A at the start |
| Day 3 | Third C | B at the start |
| Day 4 | Nothing | A, B and C mixed |
| Day 5 | Nothing | The mistakes from day 4 |
| Day 6 | Nothing | Full mock exam |
| Day 7, the night before | Nothing | Mistakes from the mock exam, then sleep |
Sources · Cepeda et al., 2008
Frequently asked questions
- Can you prepare for a final in a week?
- Yes, if you followed the course during the term. A week allows three or four spaced passes on each topic, which is the core of what the research recommends (Cepeda et al., 2008).
- How many hours a day should I study that week?
- No study gives a number of hours that fits everyone. Work in blocks with fixed breaks instead, which reduced fatigue in Biwer and colleagues (Biwer et al., 2023). The page The Pomodoro technique for studying, what a 2023 study measured explains how.
- What if only three days are left?
- Keep the same logic, tighter. See everything on the first day, quiz yourself with everything mixed on the second, rework mistakes on the last day, and sleep. The page Spaced repetition calculator, your review dates up to the exam gives the exact dates.

In Lumi, in the week before an exam, the Mist of forgetting rises over your sky. Each evening, Lumi asks you questions on the cards most likely to fade, and every right answer pushes the Mist back. You follow this plan without keeping count yourself.
Sources
- Cepeda, Vul, Rohrer, Wixted, Pashler (2008). Spacing effects in learning. A temporal ridgeline of optimal retention. Psychological Science, 19(11). doi.org/10.1111/j.1467-9280.2008.02209.x
- Cepeda, Pashler, Vul, Wixted, Rohrer (2006). Distributed practice in verbal recall tasks. A review and quantitative synthesis. Psychological Bulletin, 132(3). doi.org/10.1037/0033-2909.132.3.354
- Roediger, Karpicke (2006). Test-enhanced learning. Taking memory tests improves long-term retention. Psychological Science, 17(3). doi.org/10.1111/j.1467-9280.2006.01693.x
- Rasch, Born (2013). About sleep's role in memory. Physiological Reviews, 93(2). doi.org/10.1152/physrev.00032.2012
- Biwer, Wiradhany, Oude Egbrink, de Bruin (2023). Understanding effort regulation. Comparing Pomodoro breaks and self-regulated breaks. British Journal of Educational Psychology, 93(S2). doi.org/10.1111/bjep.12593


