The Ultimate IB Revision Guide: How to Study Effectively

In DP2, your six IB subjects are examined between late April and mid-May, covering two years of content. With internal assessment, Extended Essay, and Theory of Knowledge deadlines still landing, your revision needs a system.

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That system starts with learning where and how marks are awarded. Then locking in content with active recall, spaced repetition, and interleaving, before moving to timed past papers.

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In this guide, we’ll discuss how the IB awards marks, the revision techniques that build lasting recall, a three-phase timetable, and subject-specific strategies.

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Let’s begin with what sets IB apart.

Key takeaways

• Your IB score is out of 45, but grade boundaries change each session, so no fixed percentage guarantees a 7 in any subject.
• Active recall and spaced repetition build the strongest exam recall, while interleaving mixed topics works best in the final one to two months.
• Plan your revision timetable backwards from exam dates, blocking in internal assessment, Extended Essay, and Theory of Knowledge deadlines before any revision sessions.
• Work through past papers in stages, from single questions with the markscheme open to full timed papers, logging every lost mark in an error log.
• Each subject rewards different practice: data questions and precise terms in sciences, calculator fluency in Math, and essay outlines in humanities.
• On exam day, divide minutes by marks to pace yourself, and use any five-minute reading period before writing to pick which questions to answer first. 

Why IB revision is different from other exam prep

Most school tests you’ve taken cover the unit you just finished. The IB exams cover two years of content across six subjects, so DP1 topics appear alongside recent ones. Retention, not cramming, becomes the core skill.

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Stakes are high, too. Your six subjects are each graded 1 to 7, plus up to three core points, for a maximum of 45. In the sciences and Math: Analysis and Approaches (AA), exams carry 80% of each grade.

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Formats also differ, so one method won’t fit all. The current sciences use two papers at both levels, while Math AA higher level (HL) adds a Paper 3. That’s why IB revision differs from other exam prep.

Start with how the IB awards marks

Before revising any topic, understand how your final score is built. Knowing which parts carry the most points shows where each hour of revision pays off.

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Here’s how your 45 points break down:

• Each of your six subjects is graded 1 to 7, for a maximum of 42 points.
• Extended Essay and Theory of Knowledge grades combine for up to three more points.
• Creativity, activity, service (CAS) earns 0 points, but you still need to complete it to receive the full diploma.

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Because grade boundaries are set each session, no percentage guarantees a 7. In May 2025, the 7 boundary for Math: Applications and Interpretation HL ranged from 66% to 77% by time zone. That’s why knowing how marks are earned matters more than chasing a target score. 

Study techniques that work for IB exams

With six subjects to prepare, including topics from DP1, it’s crucial to use techniques that build lasting recall.

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In the next sections, we’ll cover three techniques that put this into practice.

1. Active recall, blurting and the Feynman technique

Your notes stay at home on exam day, so revision should train what the paper tests: retrieval. Active recall does exactly that, pulling information from memory instead of rereading it. A 2013 review of ten learning techniques rated practice testing as one of only two high-utility methods.

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Blurting is the simplest way to start. Close your notes and write everything you know about one syllabus point, such as price elasticity of demand in Economics. Then check it against your subject guide and fill the gaps in a different color.

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Blurting reveals what you remember, but the Feynman technique checks whether you understand it. Explain the same topic in plain words to a friend or family member who hasn’t studied it. Wherever you stall or reach for jargon, you’ve found a gap to revisit. 

2. Spaced repetition

Spacing out your reviews was the other high-utility method in that 2013 review. Instead of cramming a topic once, you return to it just as it starts to fade, which strengthens recall.

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The 1/3/5/7 rule is a simple starting point for scheduling this. Study new material on day 1, then review it on days 3, 5, and 7 before stretching the gaps further. Shorten the gaps for topics you keep forgetting, and lengthen them for ones that stick. 

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Flashcard apps like Anki and Quizlet take the planning off your hands. Anki times each card by how well you recalled it, ideal for Physics equations and Geography case studies.

3. Interleaving

Drilling ten questions on one topic feels smooth, because you already know which method each one needs. Real exams, however, mix different topics in one paper, so interleaving does the same within each revision session.

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In Math AA, for example, alternate calculus, statistics, and vector questions in one sitting. Spotting which method each question needs then becomes part of your practice.

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Save interleaving for the final one to two months, once your core content is secure. Before then, focused practice on one topic at a time helps you build each method first.

How to build an IB revision timetable

Each technique has its moment, so plan your timetable backwards from exam dates, blocking in coursework deadlines first.

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Below, we’ll break this into three phases.

3-4 months before your exams

Start by auditing every syllabus point in each subject guide. Test each one with active recall instead of judging by familiarity. Mark it green if it’s secure, amber if it’s shaky, and red if it’s a gap. Those reds and ambers become the backbone of your plan.

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Next, add your remaining coursework deadlines to the calendar before any revision sessions. That includes internal assessment final drafts, your Theory of Knowledge essay, and your Extended Essay submission. Blocking them in first stops coursework from eating into exam preparation.

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Then fill the remaining time with revision, giving HL subjects more sessions than standard level (SL) ones. Each HL course carries 240 recommended teaching hours against 150 at SL, so it holds more content to review.

1–2 months before your exams

With most content covered by now, shift from learning topics to answering questions under time pressure. Build up to full papers, such as the two and a half hours of History HL Paper 3. This is also the phase to start interleaving.

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Your mock results should then reshape the plan. Move every topic that cost you marks into red, even if you’d marked it green earlier. Then schedule those reds at the start of each week, before lighter review.

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Keep one full rest day every week, even as exams approach. Long timed papers are tiring, and accuracy drops when you’re fatigued. Spend that day on exercise, a hobby, or catching up with friends. Every night, aim for eight to ten hours of sleep, the range recommended for teenagers.

The final two weeks

Each day, review upcoming papers in reverse order, so the earliest is freshest. If your exams run Chemistry, Biology, then Math, start with Math, move to Biology, and finish on Chemistry. Stop learning new content and secure what you already know.

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The day before each paper, keep revision light. Reread a recent markscheme, complete one short timed section, and stop there. Skip late-night marathons, which only leave you tired on exam day.

Past papers, question banks and mock exams

Past papers are central to IB exam prep because they mirror the real exam’s wording, timing, and marking. The more closely you practice under those conditions, the clearer your weak spots become.

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Work through them in this order:

• Start with single questions and the markscheme open beside you, checking which exact words earn credit. For sciences, use papers from 2025 onward.
• Next, close the markscheme and time yourself on one section, such as Chemistry Paper 1B. It tests data analysis and experimental skills.
• Then sit full papers at the same time of day as the real exam. Work with no phone and only permitted equipment.
• After each paper, record every lost mark in an error log: the question, marks lost, and a rule to remember. Review it weekly.
• Use the official IB Questionbank, which sorts past-paper questions by topic. Drill whichever topics your error log flags most often.
• Finally, treat mock exams as a full rehearsal. They often inform predicted grades, but a weak result simply shows what to fix, not your final grade.

How to revise for each IB subject

The techniques above work in every subject, but each assessment style rewards a different kind of practice.

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In the next sections, we’ll break this down by subject group.

Sciences

Data-based questions appear in every current science course, so practice reading graphs and tables under time pressure. Biology HL Paper 1 alone includes four of them.

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Markscheme wording matters just as much. Examiners credit precise terms, such as “active site,” the part of an enzyme where its substrate binds. When a question says “explain,” define the key term first, then give the cause.

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Diagrams need the same precision, so draw labeled structures like a neuron from memory under a timer. Together, these habits turn science knowledge into marks. For a closer look at Biology’s themes and papers, read our IB Biology guide.

Math AA and AI

Math AA and Math: Applications and Interpretation (AI) share a formula booklet but not a format. AA Paper 1 bans calculators, while every AI paper allows one, so match your practice to your course.

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Either way, know your graphic display calculator (GDC) functions cold, from solving equations to normal distribution probabilities. Learn where each formula sits in the booklet, too.

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Show every step, since markschemes award method marks for correct working, even with a wrong answer. Give answers exactly or to three significant figures unless told otherwise.

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Math AA HL Paper 3 needs separate practice. Its two problem-solving questions carry 55 marks in one hour, so time full questions. For more tips, read our guide to IB Math exam preparation.

Humanities, essay subjects and languages

Where Math rewards clear, step-by-step calculations, essay-based subjects reward argument, so short essay outlines work better than memorized essays.

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Here’s how to adapt your revision to each type:

• In humanities like History and Psychology, plan a thesis, evidence, and counterargument for each syllabus point. Our IB Psychology guide shows how this beats memorizing.
• For English A, write one analytical paragraph in 15 minutes. Then grade it against the markbands, the descriptors examiners use for each level.
• In language courses, review vocabulary daily with flashcards. Then complete timed Paper 1 writing tasks in the requested text type, such as a blog post.

How to build confidence and perform on exam day

Real confidence comes from evidence, not positive thinking. When your error log shrinks week by week, you have proof your revision is working.

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On exam day, divide the minutes by the marks. Biology HL Paper 2 allows 150 minutes for 80 marks, so one mark is worth just under two minutes. A four-mark question therefore deserves about seven and a half minutes. Treat this as a guide, though, and save a few minutes at the end to check your answers.  

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Most papers also give you five minutes of reading time. Use it to pick which questions to answer first, starting with your strongest. 

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Between papers, keep your usual sleep routine and take short breaks. Skip comparing answers with friends afterward, since it can’t change your mark. If stress ever feels unmanageable, talk to friends, family, or your school counselor.

Explore IB preparation with Immerse Education

Many IB students meet independent research for the first time when their Extended Essay is already due. Skills like framing a question and writing under time pressure take longer to build than one exam season allows.

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That’s where Immerse Education can help, especially in pre-DP or DP1. At our Pre-University Summer School, participants aged 13 to 18 build those skills through university-style seminars and a personal project they present.

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If you’re weighing careers too, our Career Insights summer school pairs teaching from working professionals with off-campus industry visits. Participants aged 15 to 18 could spend an afternoon in a courtroom, studio, or trading floor. Prefer to study during term? Our Online Research pathway pairs you one-to-one with a tutor from Oxford, Cambridge, or an Ivy League university.

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Whichever pathway you choose, you’ll practice the independent study that IB revision depends on, well before exam season.

FAQs

Is IB harder than AP?

IB can be more demanding as a whole, since the diploma combines six subjects, coursework, and core requirements over two years. A single AP course can be just as challenging, but ends in one exam.

What are the 5 hardest IB subjects?

The subjects most commonly cited as hardest are Math AA HL, Physics HL, Chemistry HL, Biology HL, and English A: Literature HL. Each combines heavy content with demanding exams, though difficulty still depends on your strengths.

How many hours a day should I study for IB?

There’s no official figure, but two to three focused hours on school days suits most students. In the final weeks before exams, this often rises to five or six hours, split into blocks with breaks.

What is the best way to study for IB exams?

The best way to study for IB exams is to test yourself rather than reread notes. Combine active recall and spaced repetition with timed past papers, then check every answer against the markscheme.

What is the 1/3/5/7 rule in study?

The 1/3/5/7 rule is a popular spaced repetition schedule. You learn new material on day 1, review it on days 3, 5, and 7, then keep returning to it at longer or shorter gaps.

Is 70% a 7 in IB?

Not always, because grade boundaries shift each year with the difficulty of each paper. In May 2025, a 7 in Math: Applications and Interpretation HL needed 66% on one paper version but 77% on another.

Conclusion: revise smarter, not longer

Strong IB revision starts with how marks are awarded. From there, plan backwards from your exam dates, blocking in coursework deadlines before any revision.

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Active recall, spaced repetition, and interleaving secure the content. Past papers and a weekly error log then turn that knowledge into marks on exam day.

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Above all, remember that effective revision is a system you build over months, not hours you endure. Protect your weekly rest day and sleep along the way.

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Ready to build those habits before DP2? Explore Immerse Education and find the pathway that fits you, from university-style seminars to one-to-one research.