How to Cram for an Exam the Night Before (When You Have No Choice)
Cramming isn't ideal, but sometimes it's all you've got. How to spend the last 24 hours on what will actually earn marks — and why you still need to sleep.
Published 4 min read
Let's be honest: the best way to prepare for an exam is to start weeks earlier and space your revision out. You know that. But it's the night before, and here you are.
Cramming isn't a great way to learn, but it can be a reasonable way to pass the exam tomorrow — if you spend the hours on the right things. This guide is about making those hours count.
The truth about cramming
Cramming works in the short term and fails in the long term. Studies of spacing consistently find that spreading study out beats massing it into one session for anything you need to remember later (Cepeda et al., 2006). Crammed memories fade fast.
So, two things:
- For tomorrow's exam, a focused cram can help.
- For anything you'll need again (next term, the final, the job), plan to review it properly after the exam.
Rule 1: Don't reread. Test yourself.
The biggest mistake when cramming is rereading your notes from page one. It feels productive, but it's slow, and you'll run out of time halfway through the course.
Instead, use practice questions to find what you don't know, and spend your time there. Testing yourself is one of the most effective study techniques there is (Dunlosky et al., 2013), and when you're short on time it doubles as a diagnostic: every question you get right is a topic you can skip.
Rule 2: Triage your topics
You can't cover everything. Sort topics into three groups:
| Group | What it means | What to do |
|---|---|---|
| Shaky and likely | Likely to come up, and you're weak on it | Most of your time goes here |
| Solid | You get most questions right | A quick check, then move on |
| Unlikely or hopeless | Rarely examined, or too big to learn tonight | Skip it without guilt |
Past papers and the syllabus tell you what's likely. A quick round of questions per topic tells you what's shaky.
Rule 3: Work in short, mixed blocks
Work in 25-minute blocks with 5-minute breaks. In each block:
- Answer questions on one shaky topic.
- Check every answer. For each one you got wrong, read just the explanation and the relevant page.
- Answer those questions again before the block ends.
Switch topics between blocks. Mixing topics is harder than doing one at a time, but it's closer to the exam and helps you learn to recognise which method each question needs — in a study of maths practice by Rohrer and Taylor (2007), shuffled practice led to much better results on a later test.
Rule 4: Finish with a mock
Save the last block for a timed mock: mixed questions under exam conditions. It shows you what you still get wrong, gets you used to the pace, and gives you a final, short list to glance at in the morning.
Rule 5: Sleep
It's tempting to trade sleep for study time. Usually it's a bad trade. Sleep plays an active role in consolidating memories (Rasch & Born, 2013), and exams test more than memory — they test reading carefully, reasoning and not making careless mistakes, all of which suffer badly without sleep.
A cram schedule for one evening
| Time | What |
|---|---|
| 0:00–0:30 | Quick diagnostic: 5–10 questions per topic. Sort topics into shaky / solid / skip. |
| 0:30–2:30 | 25-minute blocks on shaky topics, mixing them. Retry misses within each block. |
| 2:30–3:00 | Timed mixed mock. |
| 3:00–3:15 | Write one page of "things I keep getting wrong". |
| Then | Stop. Sleep. |
| Morning | Read your one page. Nothing new. |
Cram mode in DeepRevision
If your material is in a DeepRevision study plan, Cram builds this session for you:
- Pick how long you have, from 30 minutes to 4 hours.
- It puts your shakiest sections first, based on how you've actually been answering — not how confident you feel.
- It works in 25-minute blocks, and finishes with one final mock.
- Every question you miss goes into your mistake analysis, so after the exam you can review what you crammed properly — with spaced repetition — and keep it.
Next time
Cramming is a rescue, not a plan. After this exam, try putting your next course into a study plan from week one: a little each day, with review built in. The night before then becomes a light review — and a full night's sleep.
Frequently asked questions
Does cramming actually work?
For the next day's exam, focused cramming can help you pass. But cramming produces memories that fade fast, so you'll forget most of it within days. For anything you'll need again, spaced study is far more efficient.
Should I stay up all night to study?
Usually not. Sleep helps consolidate what you've learned, and a sleep-deprived brain is worse at recall, reasoning and reading questions carefully. A few hours less study and a decent night's sleep is usually the better trade.
What should I study first when cramming?
Start with the topics that are both likely to come up and that you're weakest on. Use practice questions to find out quickly which those are, rather than rereading everything from the start.
How long should cram sessions be?
Work in focused blocks of around 25 minutes with short breaks, switching between topics. Long unbroken sessions lead to fading attention and a lot of rereading that doesn't stick.
Sources
- Cepeda, N. J., Pashler, H., Vul, E., Wixted, J. T., & Rohrer, D. (2006). Distributed practice in verbal recall tasks: A review and quantitative synthesis. Psychological Bulletin, 132(3), 354–380. doi:10.1037/0033-2909.132.3.354
- 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:10.1177/1529100612453266
- Rohrer, D., & Taylor, K. (2007). The shuffling of mathematics problems improves learning. Instructional Science, 35(6), 481–498. doi:10.1007/s11251-007-9015-8
- Rasch, B., & Born, J. (2013). About sleep's role in memory. Physiological Reviews, 93(2), 681–766. doi:10.1152/physrev.00032.2012
Stop studying everything. Study what you’re getting wrong.
DeepRevision turns your notes, slides and lectures into practice questions, finds the ones you keep missing and why, and brings each one back right before you’d forget it.
Written by
The people who build DeepRevision
We build DeepRevision, a study app that turns your own notes, slides and lectures into practice questions and brings back the ones you get wrong right before you'd forget them. We write about the research behind how students remember, and how to use it before an exam.
