How Is A-Level Physics Assessed?

A-level Physics is widely regarded as one of the hardest subjects out there. But just as drawing a free body diagram is the first step to solving most physics problems, understanding how the exam is structured is the first step to mastering it.

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If you're sitting AQA, you'll take three written papers at the end of Year 13, weighted 34%, 34% and 32% of the final grade, alongside a separately graded Science Practical Endorsement that carries no exam of its own.

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In this guide, we'll cover how many A-level Physics papers there are, how long each one lasts, when they're sat, and how weighting translates into the marks you need for an A*, using AQA as the worked example.

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Let's get straight into it.

Key takeaways

• AQA students sit three written exam papers at the end of Year 13, weighted 34% for Paper 1, 34% for Paper 2, and 32% for Paper 3, totalling 250 marks.
• Paper 1 covers measurements and errors, particles and radiation, waves, mechanics and materials, electricity, and periodic motion; Paper 2 covers thermal physics, fields and their consequences, and nuclear physics.
• Paper 3 is unique in structure: it splits into a compulsory 45-mark practical skills section and a 35-mark optional topic, chosen from Astrophysics, Medical Physics, Engineering Physics, Turning Points in Physics, or Electronics.
• Paper weighting varies significantly by exam board: Edexcel's Paper 3 carries the heaviest single weighting at 40% (120 marks), while OCR A weights Papers 1 and 2 most heavily at 37% each.
• The Science Practical Endorsement is graded separately as Pass or Not Classified: AQA specifies 12 required practicals, OCR organises its practical work into 12 Practical Activity Groups (PAGs), and Edexcel specifies 16 core practicals. It has no direct effect on the A*-E grade.
• There's no fixed percentage for an A*, since AQA sets the boundary after marking each year; in the 2025 series it ranged from 181-190 out of 250 (roughly 72-76%), depending on the Paper 3B option sat.

How many papers are there in A-level Physics?

AQA's A-level Physics is assessed across three written papers, each covering a distinct slice of the two-year specification.

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Here's a breakdown of what each paper covers.

Paper 1

Paper 1 is a two-hour written exam worth 85 marks, accounting for 34% of the overall A-level Physics grade, made up of 60 marks of short and long answer questions plus 25 marks of multiple choice. 

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Here's what it covers.

• Measurements and their errors - This is the toolkit section, covering significant figures and percentage uncertainty that every calculation on all three papers quietly depends on.
• Particles and radiation - Atomic structure, particle classification, and the standard model sit at the centre of this topic, alongside the photoelectric effect as evidence for wave-particle duality. 
• Waves - Examines wave properties, superposition, and diffraction, alongside the required practical on Young's slit interference and diffraction gratings. 
• Mechanics and materials - Covers forces, energy, power, and the Young modulus, testing students' ability to apply equations and interpret graphs across multi-step problems. 
• Electricity - Builds on GCSE circuit theory with resistivity, internal resistance, and potential dividers, assessed through calculation-based questions. 
• Periodic motion (6.1) - Covering circular motion and simple harmonic motion, this is the one piece of Year 13 content examined on Paper 1 rather than Paper 2.

Paper 2

Paper 2 matches Paper 1's 85 marks and 34% weighting, but AQA's own assessment breakdown shows it leans hardest on AO2, rewarding students who can apply physics rather than simply recall it.

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Here's how it breaks down.

• Thermal physics (6.2) - Covers the kinetic theory of gases, internal energy, and specific heat capacity, building directly on the mechanics and materials work from Paper 1.
• Fields and their consequences (7) - Spans gravitational, electric, and magnetic fields plus capacitance, unifying ideas that first appeared separately in mechanics and electricity.
• Nuclear physics (8) - Builds on Paper 1's particle physics with radioactive decay, binding energy, and fission and fusion, often tested through half-life calculations.

Paper 3

Every student sitting AQA answers the same questions on Papers 1 and 2, but this exam breaks that pattern with a compulsory section and a choice of five optional topics.

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The structure splits into two parts.

• Section A: Practical skills and data analysis - Worth 45 marks, this compulsory section tests data handling, graph analysis, and evaluation of experimental methods drawn from across the whole course.
• Section B: Optional topic (choose one) - Students sit one of five options here, worth 35 marks: Astrophysics, Medical Physics, Engineering Physics, Turning Points in Physics, or Electronics.

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Both sections are made up entirely of short and long answer questions, ranging from single calculations to extended written responses, with no multiple choice questions appearing anywhere on this paper.

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How long is each A-level Physics paper?

AQA gives every paper the same two hours, no matter how many marks it's worth or how heavily it's weighted toward the final grade. Paper 1 and Paper 2 both run for two hours and carry 85 marks each, giving roughly 1.4 minutes per mark. Paper 3 also runs for two hours but carries only 80 marks, leaving slightly more time per mark than the first two papers.

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Not every board keeps this consistency. Edexcel's Paper 3 runs to 2 hours 30 minutes for 120 marks, the longest single physics paper across AQA, Edexcel, and OCR, making pacing a genuine skill to practise ahead of exam day.

When are A-level Physics papers 1, 2 and 3 sat?

All three A-level Physics papers are sat in the same May/June exam series at the end of Year 13. The A-level itself is a linear qualification, so all A-level assessment happens at the end of the course, with no coursework contributing to the final grade.  Students who resit must retake the whole qualification in a later series, since individual papers can't be carried forward or resat on their own.

How are the A-level Physics papers weighted?

Not every paper counts equally toward the final grade, and how heavily each one is weighted differs by exam board, which matters if you're revising with the wrong board's numbers in mind.

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Here are the published weightings for AQA, Edexcel, and OCR.

What is the Science Practical Endorsement?

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The Science Practical Endorsement is a separately reported endorsement you complete alongside A-level Physics, assessed by your teacher and graded Pass or Not Classified rather than contributing to your A*-E grade. It's reported separately on your certificate. 

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Your teacher assesses you against the Common Practical Assessment Criteria (CPAC), a shared standard across AQA, Edexcel, and OCR, covering how well you follow procedures, use equipment safely, and record and report your results. There's no written exam for the endorsement itself.

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The required number of practicals differs by board: AQA specifies 12 required practicals, OCR organises its practical work into 12 Practical Activity Groups (PAGs), and Edexcel specifies 16 core practicals. 

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You need to consistently meet every CPAC competency across these practicals to earn a Pass. Because the endorsement is reported separately, it has no effect on your A*-E grade.

What paper weighting means for your grade (and your A*)

Forget the old rule that you need 90% on every paper for an A*, since that only applied to the modular A-level phased out years ago. 

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Under AQA's current linear spec, your A* boundary is a single total-mark threshold set after marking, and it isn't even fixed: in the 2025 series it ranged from 181 to 190 out of 250, depending on which Paper 3B option you sat. That's roughly 72-76%. 

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Knowing the weighting is still useful context for how you think about your revision, even though a two-point gap between papers isn't a reason to deprioritise any one of them. All three papers carry enough weight that a weak topic on any of them is worth fixing. 

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If you're still deciding whether the subject is right for you, our guide on how hard A-level Physics really is is worth a read.

Explore Physics With Immerse Education

Understanding how A-level Physics is assessed only gets you so far if you're still deciding whether the subject is worth the challenge, or wondering where it leads beyond the syllabus.

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Immerse Education's Physics Summer School pushes further into topics like classical mechanics, thermodynamics, and quantum physics, taught in a university-style environment by tutors from world-leading institutions. 

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Rather than simply covering exam content, sessions explore how these ideas connect to real research and degree study, giving students a genuine sense of what physics looks like beyond A-level. 

FAQs

How many exam papers are there in A-level Physics?

AQA students sit three exam papers: Paper 1, Paper 2, and Paper 3. Each is a two-hour written exam, and together they determine the full A*–E grade.

Are A-level Physics papers the same across all exam boards?

No. AQA, Edexcel, and OCR all differ in paper length, marks, and weighting. Edexcel's Paper 3 carries the heaviest single weighting at 40%, while OCR A splits weighting most evenly toward Papers 1 and 2.

Does the Science Practical Endorsement affect my final grade?

No. It's graded separately as Pass or Not Classified and reported alongside, not within, your A*–E grade for A-level Physics.

What happens if I fail the Practical Endorsement?

You receive a Not Classified result on your certificate. Your A*-E grade is unaffected, but many science degree courses list a Pass as a separate condition of their offer, so it's worth checking your specific course's entry requirements. 

What percentage do I need for an A* in A-level Physics?

There's no fixed percentage. AQA's A* boundary is set after marking each year and varies by Paper 3B option, ranging from 72–76% in the 2025 series.

When do A-level Physics grade boundaries come out?

Grade boundaries are published on A-level results day each year, typically in mid-August.

Conclusion: Understanding A-level Physics assessment

Once you know how A-level Physics is assessed, revision stops being guesswork. Three papers, each weighted differently, decide the shape of your final grade.

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Understanding that structure is the real takeaway here. Knowing how the marks are allocated across papers helps you revise with a clearer sense of the whole qualification, rather than treating every topic as an isolated block. 

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The Science Practical Endorsement sits alongside all three, graded separately as Pass or Not Classified, but it's still part of the full picture behind the qualification.

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With that picture in mind, the next step is going beyond it. Immerse Education's Physics Summer School is where the syllabus stops and the real physics begins.