Is it better to revise the same amount for every IB subject?

Equal time feels fair, but the IB isn’t graded on fairness. It’s graded on performance across different task types: calculations, essays, data response, evaluation, and timed decision-making. If one subject consistently costs you marks because of technique or missing content, equal time locks in an unequal outcome. A smarter approach is “equal respect” for each subject, but weighted time based on weakness and paper demand. This is why HL subjects tend to require 6--8 hours while SL subjects often sit at 4--6 hours. The goal is not symmetry--it’s stability and coverage. Once a weak subject improves, you can reduce hours and maintain with flashcards and short practice sets.

How do I know if my IB revision hours are actually working?

The IB gives you a simple truth: if you aren’t doing exam-style questions, you don’t really know. Progress should show up as higher accuracy, faster methods, and fewer repeated mistakes across weeks. The most useful metric is an “error log” that tracks patterns (not just topics): missing command terms, poor evaluation, wrong units, unclear structure, or rushed timing. RevisionDojo’s loop makes this measurable because the Questionbank gives repetition, and feedback makes the next step obvious. Add one timed session per week using IB Predicted Papers by IB Examiners (Free) to test stamina and pacing. If your timed score isn’t moving after two weeks, don’t add hours--change the mix toward marking, review, and targeted reattempts.

What if I have IAs, TOK, and EE at the same time as IB revision?

This is the hidden difficulty of the IB: you’re revising for finals while building major internal deadlines. The answer isn’t to “push through” with longer nights. It’s to use seasons: in heavy IA weeks, reduce subject revision hours but keep a small daily minimum (even 20 minutes of flashcards) so you don’t lose momentum. Then, once the deadline passes, you ramp back up using the same weekly baseline (HL 6--8, SL 4--6). RevisionDojo helps here because it compresses time: Study Notes rebuild concepts fast, Flashcards maintain memory in short bursts, and the Questionbank gives high-yield practice without setup. When coursework quality is the priority, use Grading tools and the Coursework Library to avoid rewriting blindly. And if you’re stuck, Tutors can shorten a week of confusion into one clear session.

How Long Should You Revise for Each IB Subject?

RevisionDojo Team

•7/9/2025•8 min read

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How Long Should You Revise for Each IB Subject?

RevisionDojo Team

•7/9/2025•8 min read

When people ask, “How long should I revise for each IB subject?” they’re usually asking something more honest:

“How do I stop feeling behind, without burning out?”

Because IB revision doesn’t fail from laziness. It fails from vagueness. You sit down, open a book, scroll for a while, and stand up later with the strange exhaustion of someone who worked hard on the wrong thing.

The goal of this guide is to give you a time plan you can trust--and a way to adjust it when real life (IAs, deadlines, tiredness) inevitably shows up.

A stick-figure student builds a NASA-like revision timetable wall.

The simple weekly rule for IB revision time

Here’s the most reliable baseline for IB students preparing for exams:

HL subjects: 6--8 hours per subject per week
SL subjects: 4--6 hours per subject per week

This isn’t about “studying more.” It’s about matching time to what the IB actually demands: depth, accuracy, and exam technique.

If you want a broader weekly-hours view (especially as exams approach), pair this with How Many Hours Should IB Students Study?.

A quick checklist before you allocate hours

Before you decide exact numbers, run this five-point IB checklist:

Which subjects are HL and which are SL?
Which subjects lose marks from content gaps (not just speed)?
Which subjects lose marks from technique (command terms, structure, evaluation)?
Which subjects have the most papers or the longest writing time?
Which subject currently drains you emotionally (often a sign it needs structure, not more hours)?

If your schedule is messy, use this companion guide: How to Create a Balanced IB Study Schedule.

How long should you revise for HL vs SL IB subjects?

HL time is heavier for a boring reason: HL questions punish shallow understanding. They require more steps, more explanation, and more precision under pressure.

So if your week is limited, a helpful default is to weight your IB time like this:

60% of your revision time to HL
40% of your revision time to SL

Then customize.

A realistic weekly example (3 HL + 3 SL)

A typical IB combo might look like:

HL: 3 subjects × 7 hours = 21 hours/week
SL: 3 subjects × 5 hours = 15 hours/week

That’s ~36 hours/week of subject revision.

Important: that’s just subjects. You still need space for TOK, EE, IAs, and normal life. The best IB schedules don’t deny reality--they budget for it.

The best way to spend your IB hours (so they count)

Two students can both do “six hours of IB Biology.” One improves fast. One doesn’t.

The difference is what the hours contain.

A strong split for most IB subjects:

60--70% practice questions + marking
20--30% concept rebuild (notes, examples, micro-topics)
10% planning + error log

This is where RevisionDojo becomes less like a resource and more like a system.

Use the Questionbank to make practice your default, not your “if there’s time.”
Use IB Flashcards with Spaced Repetition (SRS) for daily memory maintenance.
Use the Flashcards feature to turn weak notes into quick recall.
Use AI Chat to ask, “What would earn full marks here?” while the mistake is still fresh.
Use Grading tools when written responses are the bottleneck.
Use Predicted Papers and Mock Exams when timing and stamina are the bottleneck.

A textbook looks offended while a student uses active recall.

A weekly IB structure you can copy (without overthinking)

Try this repeatable rhythm for each IB subject:

Two shorter weekday sessions (45--60 minutes)

10 min: quick concept refresh (one micro-topic)
25--35 min: focused Questionbank set
10 min: mark + write 1--3 “error rules”

One longer weekend session (90--120 minutes)

45--60 min: mixed practice or a timed section
20--30 min: review errors and rebuild the weakest subtopic
10--15 min: flashcards to lock in recall

This kind of structure is explained even more concretely in Is 4 Hours of Study Enough for IB?.

How to ramp up IB revision as exams get closer

One of the biggest IB mistakes is jumping from “barely revising” to “three hours a night” in a week. It feels heroic, then collapses.

Instead, increase gradually:

3--4 months out: keep baseline hours, focus on coverage + fixing chronic weak topics
6--8 weeks out: increase hours by 30--60%, add weekly timed work
Final month: more timed practice, more review, fewer new notes

For realistic timelines (not fantasy routines), see How Long Did It Take to Study for the IB Exams? and Is 1 Month Enough to Study for IB Exams?.

A student lifts “Practice Questions” while “Rereading” is tiny.

Use subject type to adjust your IB hours

Not all IB subjects spend time the same way.

Content-heavy sciences (Biology, Chemistry, Physics)

You usually need more time early for rebuilding foundations, then heavy practice later.
A good move is to anchor your revision in a subject hub (example: IB Biology Resources) and run a loop: Notes -- Questions -- Feedback -- Flashcards.

Math subjects

Math rewards volume and variety. More frequent, shorter sessions beat one long weekly block.
Questionbank drilling matters here because it teaches patterns, not just content.

Essay-heavy humanities and languages

Hours should tilt toward writing under constraints: plans, timed paragraphs, and criterion-focused improvement.
This is where Tutors, the Coursework Library, and Grading tools can save hours by making feedback immediate and specific.

The takeaway: give each IB subject a budget, then make it measurable

So, how long should you revise for each IB subject?

Start here:

HL: 6--8 hours/week
SL: 4--6 hours/week

Then protect quality: make most of those hours active, marked, and specific.

If you want the easiest way to run this without reinventing your routine every day, build your week inside RevisionDojo: practice with the Questionbank, retain with Flashcards, clarify with AI Chat, rehearse with Predicted Papers and Mock Exams, and tighten your writing using Grading tools, the Coursework Library, and Tutors.

Your IB schedule doesn’t need to be perfect. It needs to be repeatable. And repeatable is what gets you to calm confidence on exam day.