O Level & IGCSE Physics: The Complete Guide to an A* Grade
ARTICLE:
O Level (5054) and IGCSE (0625) Physics sit at the same level and share most of their content. This guide covers how the two compare, which topics carry the most marks, where students routinely lose easy marks, and a 30-day revision plan that reliably lifts grades.
O Level (5054) vs IGCSE (0625)
Both qualifications are Cambridge, taken at the same stage, with heavily overlapping content. The differences are in assessment structure rather than the physics itself.
| O Level 5054 | IGCSE 0625 | |
|---|---|---|
| Tiering | Single tier | Core and Extended |
| Practical | Practical test or alternative | Paper 5 (practical) or Paper 6 (ATP) |
| Top grade | A* | A* (Extended only) |
In practice most students do not choose — the school decides. If yours offers both and you want an A*, make sure you are entered for Extended IGCSE rather than Core. For a full comparison of the two qualification families, see GCSE vs IGCSE.
The topics that carry the most marks
Free topic-by-topic notes for all of these are on our free O Level & IGCSE notes page.
- Forces, motion and momentum
- Energy, work, power and pressure
- Thermal physics and kinetic theory
- Waves, light, lenses and sound
- Electricity and circuits
- Magnetism and electromagnetic induction
- Atomic and nuclear physics
Where students actually lose marks
Rarely on hard physics. The recurring losses are avoidable habits:
- Definitions written approximately instead of in the exact syllabus wording.
- Missing or wrong units on answers, table headings and graph axes.
- Ray and circuit diagrams drawn freehand instead of with a ruler.
- Graphs drawn too small to plot accurately.
- Answering “explain” with a bare calculation and no reasoning.
💡 Fixing these five habits alone typically moves a student up a grade — before they learn a single new piece of physics.
Exam technique that works
Step 1: Learn definitions word-perfect
Write them out from memory, then check against the syllabus wording until they are exact. This is the cheapest source of marks in the paper.
Step 2: Draw diagrams with a ruler
Ray diagrams and circuit diagrams carry easy marks that sloppiness throws away.
Step 3: Always show working
Method marks are available even when the final answer is wrong — but only if the examiner can see your reasoning.
Step 4: Check units at the end of every calculation
It takes seconds and saves marks in every single paper.
A 30-day revision plan
For the full method behind step two, see our pillar guide on Cambridge Physics past papers , and the dedicated O Level & IGCSE Physics page for syllabus detail.
| Days | Focus | Daily target |
|---|---|---|
| 1–15 | One topic per day: read notes, then topical past-paper questions |
1 topic + 1 question set |
| 16–25 | Full past papers under timed conditions, self-marked |
1 paper every 2 days + same-day marking |
| 26–30 | Error log only – re-attempt logged mistakes, review definitions |
No new papers; consolidate |
Frequently Asked Questions
Which is harder, O Level or IGCSE Physics?
Neither is clearly harder. Extended IGCSE and O Level are comparable in demand, and content overlaps heavily. If you are targeting an A*, the important thing is being entered for Extended rather than Core in IGCSE.
What is Paper 6 in IGCSE Physics?
Paper 6 is the Alternative to Practical, which tests experimental understanding in written form instead of in a laboratory. It rewards technique, so it improves quickly with focused practice.
How long before exams should I start revising?
Serious revision should begin at least two to three months out, with topical past-paper questions running alongside the syllabus all year rather than saved until the end.
Do I need to memorise formulas?
Cambridge provides some formulas, but you should know the common ones fluently so you are not slowed down. Note that Pearson Edexcel requires more formula recall from memory than Cambridge.
Where do students lose the most marks?
On imprecise definitions, missing units, freehand diagrams and undersized graphs — not on difficult reasoning. Fixing those habits typically lifts a grade.
Author byline: Sir Mahad Amer — Cambridge-certified Physics teacher, MSc Physics, founder of MAC Education Network.
