IB Physics has a reputation, and it is not undeserved. Students who sailed through GCSE or middle school science often hit a wall in their first term and wonder what went wrong.
Nothing went wrong. IB Physics is genuinely difficult. But the things that make it hard are specific and learnable. Once you understand what you are actually up against, it becomes much more manageable.
The students who struggle most in IB Physics are not the ones who find physics hard. They are the ones who keep trying to study it the same way they studied at GCSE.
Reason 1: The breadth is enormous
IB Physics covers 24 topics across five themes in two years. That is kinematics, forces, energy, thermal physics, gas laws, circuits, simple harmonic motion, waves, diffraction, gravitational fields, electric fields, magnetic fields, induction, atomic structure, quantum physics, radioactive decay, fission, fusion, and more.
At GCSE, you cover a much smaller range of content, and the depth required is nothing like what the IB demands.
What makes this harder is that IB Physics does not exist in isolation. You are studying five or six other demanding subjects at the same time. Every decision about where to spend your study time is a trade-off.
What actually helps: Prioritise by teaching hours. The IB allocates more time to topics that carry more marks. Theme A (Space, Time and Motion) and Theme D (Fields) together represent a large proportion of the final exam. See the full breakdown in the IB Physics topic priorities guide.
Reason 2: The jump from GCSE is bigger than expected
At GCSE, most physics questions reward recall. You learn a definition, a formula, a fact. The question asks you to state it or apply it once.
IB Physics is a different game. Questions routinely ask you to apply physics you understand to a scenario you have never seen before. The context is unfamiliar. The numbers are awkward. The question is worth four marks and you have two minutes.
The maths itself is not especially advanced. There is no calculus. But applying maths reliably under time pressure to new situations is a skill that needs to be built deliberately.
What actually helps: Past papers. Not just reading through them, but sitting down with a blank page, working through questions without your notes, and then marking your own work against the mark scheme. That process, repeated consistently, is what builds the ability to handle unfamiliar questions.
Reason 3: Understanding the physics and getting the marks are two different things
This is the one that catches the most students out.
You can fully understand a concept and still drop half the marks on a question about it. IB Physics exams are assessed against a very specific mark scheme, and that mark scheme has particular expectations about how you express your answers.
The IB uses command terms to tell you what kind of response is required. “Define” means the exact definition from the syllabus. “Explain” means cause and effect, one point per mark. “Calculate” means formula, substituted values, working shown, units, correct significant figures.
Students who know their physics but have not practised exam technique often produce answers that are correct but do not score. They write explanations where the mark scheme wants definitions. They write qualitative answers where the mark scheme wants a formula.
What actually helps: Study the mark scheme as carefully as you study the physics. When you get a question wrong, ask not just “what is the right answer” but “what does the mark scheme expect and why.” That shift in approach makes a significant difference.
Reason 4: The IA takes real time and energy
The Scientific Investigation is worth 20% of your final grade. That is a lot. And it is due during Year 1 or early Year 2, when you are still learning the content for your exams.
Students who are not aware of this often find themselves doing a rushed IA while falling behind on topic content. Students who plan well use the IA as an opportunity to bank 20% of their grade before the written exams even begin.
What actually helps: Treat the IA as an exam paper that you write over several weeks. Front-load the work. Get your research question approved early, collect data as soon as you can, and give yourself time to write and redraft. A well-executed IA can make the difference between grade boundaries.
Reason 5: There is not a lot of support at the right level
Most IB Physics students have one teacher covering 24 topics. That teacher may be excellent, but class time is limited and the syllabus is large. Many students fall behind on a topic, do not get enough practice, and carry gaps forward into later topics that build on what they missed.
Students at schools where the teacher is less experienced with the current IB Physics syllabus (first examined 2025) face an additional challenge: some teachers are still developing their own understanding of the new content.
What actually helps: Take control of your own learning. The free GradePod tutorials cover every topic in the current IB Physics syllabus. If your teacher’s explanation of a topic did not land, you can watch a different explanation the same evening.
What this does not mean
IB Physics is hard. But hard is not the same as unreasonable.
The grade boundary for a 7 in IB Physics HL is around 68%. For SL it is around 65%. You do not need to get everything right. You need to lose as few marks as possible on the things you know, and develop enough technique to pick up marks on the things you are less sure about.
Around 22% of HL students achieve a 7 every year. These are not all exceptional natural physicists. Many of them are students who found it hard in Year 1, identified what was costing them marks, and changed their approach.
IB Physics is hard in the same way that learning to drive is hard. It takes practice, it takes a good system, and it becomes much more manageable once you stop being surprised by what you are being asked to do.
If you want a clear system for getting a 7 in IB Physics, the complete study guide is the place to start.
How to Study IB Physics: The Complete Guide to Getting a 7 →
Sally Weatherly is a Fellow of the Institute of Physics, author of 4 IB Physics books, and founder of GradePod. She has been teaching IB Physics since 2004.