IGCSE Physics Grade Boundaries Explained

A grade boundary is the minimum mark that earns a grade. On IGCSE Physics 0625, your three component marks combine into one weighted total, and Cambridge sets the boundaries for that total after every exam session. Understanding this system tells you exactly how many marks you can afford to drop, and where the cheapest marks live.

How do raw marks become a grade in IGCSE Physics?

Each paper is marked out of its raw total, then weighted into a final mark out of 100 (reported as a Percentage Uniform Mark or weighted total, depending on the series). Cambridge then compares your weighted total against the grade thresholds set for your variant and session. There is no fixed pass mark: the boundary moves with each paper’s difficulty.

Here is the component structure for the Extended route:

Core candidates sit Paper 1 (40 marks, 30%) and Paper 3 (80 marks, 50%) with the same practical component at 20%. Schools with lab access may enter Paper 5 (the practical test) instead of Paper 6; the weighting stays 20%.

The weighting matters more than most students realise. Paper 4 carries half your grade. One careless calculation page on Paper 4 outweighs two wrong MCQs on Paper 2. Equally, Paper 6 is only 40 raw marks but contributes a fifth of your total, and its marks are the most predictable on the syllabus, because the same measurement, graph and improvement questions recur in nearly every series.

What are typical grade boundaries for 0625?

Boundaries vary by session, and that caveat applies to every number below. As a planning guide, recent Extended series have shown patterns roughly like this, expressed as a percentage of the weighted total:

Two practical conclusions. First, an A* almost never requires a near-perfect paper. In most sessions you can drop 20 or more weighted marks and still reach the top grade. Second, the gap between grades is usually 10 to 13 percentage points, which is roughly 12 to 16 raw marks across the three papers. That is the size of one good revision push. A fixed Paper 6 routine, or mastery of the equation list, is often a full grade.

Always check the official “grade thresholds” document Cambridge publishes for your exact session and variant on cambridgeinternational.org. Variant 1, 2 and 3 papers differ, so their thresholds differ too. Malaysian schools typically sit variant 2.

Can Core candidates get an A?

No. The Core route caps the available grades at C. Core candidates receive grades C, D, E, F or G; anything below G is ungraded. Extended candidates can receive A*, A, B, C, D or E. This ceiling is the single most important fact in the Core vs Extended decision.

The trap runs both ways. A borderline student pushed onto Extended who lands below the E boundary gets ungraded, while the same performance on Core might have earned a D. A strong student left on Core hits the C ceiling no matter how well they perform. Schools usually decide entries around six to nine months before the exam, so raise the conversation early if you think the tier is wrong. The free 1-hour trial lesson is a real taught class where your child meets the tutor, and if you ask, the tutor can give a view on tier with evidence rather than gut feel.

Why do boundaries move between sessions?

Cambridge uses a process called awarding. Senior examiners review the statistical performance of the whole cohort, compare scripts against archived scripts from previous sessions, and set each boundary so the grade represents the same standard year on year. A November paper with an unusually hard Paper 4 will get lower thresholds than a gentler June paper.

This has three consequences for your revision:

1. Never judge yourself against one session’s thresholds. Marking your practice paper against the hardest recent session’s boundaries can be misleading in both directions.
2. Use a margin. If you want an A, train until you consistently score at the typical A* range on timed past papers. Exam-day performance usually sits below practice performance.
3. Difficulty evens out. If your paper felt brutal, the boundary probably reflects that. Do not let a hard Paper 4 wreck your Paper 6 the next week.

How many marks can you afford to lose per paper?

Work backwards from a target. Suppose you want an A and assume a boundary near 65% of the weighted total. The weighted total is built from 40 + 80 + 40 raw marks at 30/50/20 weighting. A balanced way to hit 65% looks like: 28/40 on Paper 2, 52/80 on Paper 4, and 27/40 on Paper 6.

Seen this way, the targets stop being scary. You can leave a whole 6-mark question blank on Paper 4 and miss a dozen MCQs and still be on course. Most students lose more marks to rushed working, missing units and ignored command words than to physics they never learnt, which is why mark-scheme-aware practice beats re-reading notes.

The reverse calculation also helps borderline candidates. To clear a C-grade boundary near 40%, you need roughly 16/40, 32/80 and 16/40. Securing every definition, every one-mark recall and the standard Paper 6 graph routine gets you most of the way there before touching the hardest Supplement content.

Where do students gain a grade fastest?

In our experience teaching 0625 students across Malaysia, the fastest boundary-crossing gains come from three places. Paper 6 technique, because its 40 marks follow repeatable patterns. The equation list, because calculation questions are the most learnable marks on Papers 2 and 4. And command words, because mismatched answers lose marks the student already “knew”. In 1-to-1 classes we benchmark a student against realistic thresholds in week one, then track the weighted total after every timed paper, so progress towards a target grade is measured rather than guessed.

Boundaries reward consistency across all three components. Know your weighting, set raw-mark targets per paper, leave yourself a margin above the typical range, and remember every published number varies by session.