IB Physics Grade Boundaries: What's a Good Score?

IB Physics grade boundaries aren't fixed — they're set fresh after every exam session, based on how difficult that particular paper turned out to be. As a rough pattern across recent sessions, a 7 usually sits around 75-85% of total marks, a 6 around 65-75%, and a bare pass (grade 4) can be as low as 20-25%.

Yes — both SL and HL Physics report a final grade on the same 1 to 7 scale, and universities treat a 7 as a 7 regardless of level. What differs is the content tested and how hard it is to earn each grade: HL covers more material at greater mathematical depth, so the boundaries can sit a few points apart from SL in the same session.

There's no single fixed percentage — the exact cut-off is set after each session once examiners have reviewed how the whole global cohort performed on that paper. In recent sessions, HL Physics 7s have typically needed somewhere around 78-85% of total weighted marks, combining Paper 1, Paper 2 and the internal assessment.

Yes — the IB recalculates grade boundaries after every May and November session using statistical analysis of that session's global results. A harder Paper 2 one year can push the 7 boundary down several points compared with an easier paper the year before, so don't compare your mock percentage directly to last year's published boundary.

Yes, realistically — Physics HL is one of the more demanding DP sciences, and 7s aren't handed out easily. It combines calculus-level maths, dense content across five themes, and long data-based questions on Paper 2 that punish weak exam technique as much as weak content knowledge. Students who drill command terms like 'analyse' and 'evaluate' specifically tend to move up faster than those who just re-read notes.

For most competitive offers, a 6 or 7 at HL Physics is considered strong, and many engineering or physical science degrees name that grade explicitly in their conditions. A 5 is respectable and won't close doors on its own, but physics-heavy degrees usually want a 6 or 7 either at HL, or at SL where SL is accepted.

IB Physics is graded through two written exams plus one piece of coursework. Paper 1 and Paper 2 together make up 80% of the final mark, testing multiple-choice, data-based and extended-response questions; the internal assessment — a single scientific investigation you design and write up yourself — makes up the remaining 20%, marked against four assessment criteria.

The jump from 6 to 7 is usually about technique, not missing content. The three gaps I see most in fifteen years of marking mocks: incomplete working on multi-step calculations, confusing command terms like 'determine' with 'deduce', and running out of time on Paper 2's longer data-based questions because pacing was never practised properly.

IB Physics has two written exam papers under the current guide, first assessed in 2025. Paper 1 mixes multiple-choice and data-based questions; Paper 2 covers short-answer and extended-response questions across the whole syllabus. Together they're worth 80% of the final grade, with the internal assessment making up the remaining 20% at both SL and HL.

SL and HL share the same five themes — Space Time and Motion, the Particulate Nature of Matter, Wave Behaviour, Fields, and Nuclear and Quantum Physics — but HL goes deeper into each one and demands more calculus-based maths, particularly in kinematics, circuits and field problems. HL also carries around 60 extra teaching hours built into the guide.

Yes, through the internal assessment. Every Physics student completes one individual scientific investigation worth 20% of the final grade, marked against criteria covering research design, data analysis, conclusion and evaluation. Regular lab practicals and Group 4 Project hours build the skills for this but aren't separately graded.

It depends on their maths confidence and intended degree. If your child wants engineering, physical sciences or a physics-heavy course at university, HL is usually the safer route since many programmes name it explicitly. If Physics is a supporting subject alongside a non-science major, SL covers the same core themes with a lighter maths and time load.

They're demanding in different ways rather than one being strictly harder. A-Level Physics goes deep into a narrower set of topics with no coursework component, while IB Physics HL covers similar depth but adds an internal assessment, data-based exam questions, and the workload of five other DP subjects plus TOK and the Extended Essay running alongside it.

Past paper practice under real timed conditions moves the needle more than anything else — examiners consistently note students losing marks on command terms and data-based questions they've simply never drilled. Topical worksheets that isolate one theme at a time, alongside concise revision notes for quick equation recall, work well built around full mock papers rather than replacing them.

Costs vary hugely. A private tutor can run GBP 40-80 an hour in most markets, which adds up fast across two years, while self-study resources — structured revision notes, topical worksheets and full mock papers — cost a fraction of that and let your child practise on their own schedule. Many families use resource-based prep as the cheaper first step before considering anything else.