Study Planning
How Many Hours a Day Should You Revise for A-Levels?
Quick answer
"How many hours do you revise?" It's the most asked question in every sixth form common room, and it's the wrong one. I got top A-level grades and then survived a medical degree, and I can tell you honestly: the students pulling 8-hour library days were rarely the ones at the top of the results list. Hours are an input. Exams pay for output. So let's go through the actual numbers that matter, by year group and time of year, and why doing more so often produces less.
Key takeaways
- ✓Year 12 term time: 4 to 6 hours a week of consolidation beyond homework. Year 13 term time: 6 to 8 hours a week.
- ✓Holidays: 1.5 to 2 focused hours a day, five days a week. That includes the all-important Year 12 summer.
- ✓Exam season: 4 to 6 hours a day in blocks of 45 to 60 minutes. The hours past six add almost nothing.
- ✓One focused hour of active recall beats three passive hours of re-reading. Technique multiplies time.
- ✓Sleep is part of revision. Your memory consolidates overnight, so late-night cramming actively undoes the day's work.
Why "how many hours" is the wrong question
Let me give you two students revising for the same biology exam. Student A spends six hours re-reading and highlighting notes. It feels thorough, and the familiar pages feel like knowledge. Student B spends two hours doing past paper questions and blurting, repeatedly forcing content out of their memory and checking the gaps. Student B walks in better prepared, in a third of the time. That's not a motivational poster. The advantage of testing yourself over re-reading is one of the most consistent findings in the whole science of learning.
So the real question is this. How many hours of high-quality recall practice, spread across the week, does each stage of A-levels need? And that has concrete answers.
The numbers, by year group and season
Year 12, term time: 4 to 6 hours a week
On top of homework, aim for 1 to 1.5 hours per subject per week of genuine consolidation. Turn the week's lessons into flashcards, blurt the new topics, do a handful of exam questions. It sounds undramatic. It's also exactly what separates students who arrive at Year 12 exams calm from students who discover in May that they've got a year of debt to repay. And remember, Year 12 exams largely set your predicted grades.
The Year 12 summer: 1.5 to 2 hours a day
Two weeks of full rest, then roughly 60 to 80 hours across the holiday, split between repairing weak Year 12 topics and previewing early Year 13 content. Hour for hour, this is the most valuable revision period of the entire two years. I've written a complete guide to the Year 12 summer.
Year 13, term time: 6 to 8 hours a week
Two hours per subject. One consolidating new content, one retrieving older content so it doesn't decay. Students who do this hit spring needing to polish. Everyone else hits spring needing to relearn.
Easter and exam season: 4 to 6 hours a day
Three blocks of 90 to 120 minutes, each with breaks inside it. Prioritise past papers under timed conditions and recall work on your weak topics. Six hours of this, daily, is a serious amount of work. Students who claim ten are usually counting the time their notes were open, not the time their brain was.
The 8-hour myth
Structure beats willpower
- Work in blocks. 45 to 60 minutes on, 10 to 15 off. One topic per block, chosen in advance. Deciding what to revise during revision time is how an hour disappears.
- Space your subjects. Revisit each topic on a rising interval (next day, then day 3 or 4, then a week later) rather than binging one subject for a week. Mixing feels harder. It remembers better.
- Protect your sleep like a grade depends on it, because it does. Overnight is when the day's recall practice gets written into long-term memory.
- Put your phone in a different room. Every glance costs you the several minutes of refocusing that follow it. Most "six-hour days" contain ninety phone-minutes that nobody counted.
If you'd rather not build the schedule by hand, this is exactly what our free tool does. It takes your subjects, weak topics and fixed commitments, and generates a weekly plan with spaced repetition and active recall sessions already placed.
Free: get a revision timetable built for you
Answer a few questions about your subjects and weak topics, and our free revision tracker builds you a personalised weekly plan using spaced repetition, the same method covered in this article.
Build My Free TimetableThe bottom line
Revise less than you feared, better than you planned. During term, protect a modest weekly rhythm. In the holidays, two good morning hours. In exam season, four to six serious ones. Spend them testing yourself, and spend them on your weakest topics, because that's where every cheap mark lives. The student doing that for three hours a day beats the eight-hour highlighter every single time.
Want the hours to count for more?
Our live small-group A-level courses in Biology, Chemistry, Maths and Physics teach the high-yield content and exam technique directly, so your independent hours go further. Led by Dr Waleed Ahmad, a doctor and former top-performing A-level student. First session risk-free.
See Our A-Level CoursesFrequently asked questions
How many hours a day should I revise during exam season?
During study leave and exam season, 4 to 6 focused hours a day is the realistic maximum for most students, split into three blocks with proper breaks. Beyond that, quality collapses. You end up re-reading rather than testing yourself, and you borrow energy from tomorrow. Going past 8 hours is almost never worth it. That marginal hour adds close to nothing.
How many hours a week should a Year 12 student study outside lessons?
During term time, aim for 1 to 1.5 hours per subject per week of genuine consolidation on top of homework. So roughly 4 to 6 hours a week for three subjects. It sounds modest, but done weekly with active recall it stops the content debt building up, which is what forces panicked 8-hour days later.
Is it better to revise in the morning or at night?
The best time is whenever you can reliably focus. Consistency beats everything else. That said, most students focus better earlier. A morning block gets done before the day wears down your willpower, and late-night sessions cost you sleep, which is when memories actually consolidate. Sacrificing sleep to revise means trading away the thing that makes revision work.
How long should each revision session be?
Work in blocks of 45 to 60 minutes with breaks of 10 to 15 minutes, or 25-minute Pomodoro cycles if your focus is shaky. One subject or one topic per block. The break is part of the method. Your attention genuinely runs down, and a short recovery restores it.
What if I can only manage 2 hours a day?
Two genuinely focused hours of active recall (blurting, past paper questions, flashcards) beats six hours of re-reading notes. If your time is tight, spend all of it testing yourself on your weakest topics, and let a timetable decide which topic each day so no subject silently disappears.
Written by Dr Waleed Ahmad, MBBS
Waleed is a UK doctor and former top-performing A-level student. He founded A-Level Accelerators and has worked with over 1,000 A-level students on revision systems, exam technique and grade improvement. Everything on this blog comes from methods he used himself and teaches students every week.
Questions? Get in touch →