How Is A-Level Computer Science Assessed?

Most A-levels test what you know on paper. A-level Computer Science is different, since part of your grade depends on a working, functioning piece of code you build yourself. That changes how you should revise.

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On the AQA and OCR boards, your grade comes from two exam papers worth 40% each plus a Non-Exam Assessment worth 20%, where you design and code that solution, but each board tests different content in a different format. 

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In this guide, we'll discuss the paper-by-paper breakdown for AQA and OCR, the NEA's five weighted sections, the three assessment objectives behind every mark, and what the 2026 grade boundaries reveal about difficulty.

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Here's what you need to know before Paper 1 and Paper 2.

Key takeaways

• A-level Computer Science is assessed through two exam papers worth 40% each, sat in the same May/June series, and a Non-Exam Assessment (NEA) worth 20%, completed and submitted earlier in Year 13.
• AQA's Paper 1 is an on-screen coding exam, while OCR's two papers, including "Algorithms and Programming," are both written theory answered using pseudocode rather than a computer.
• AQA's NEA totals 75 marks across five sections (Analysis, Documented design, Technical solution, Testing, Evaluation); OCR's NEA totals 70 marks across four sections (Analysis, Design, Developing the coded solution, Evaluation).
• Every mark maps to the same three assessment objectives (AO1 knowledge, AO2 application, AO3 design and evaluate) on both boards, though which paper leans on which AO differs.
• In 2026, only 5.7% of OCR Computer Science students achieved an A*, compared with 7.9% on AQA, showing the subject's top-end difficulty varies meaningfully by exam board. 
• The 2026 A* boundary was 314/375 (83.7%) on AQA and 289/350 (82.6%) on OCR; reaching it takes board-specific revision, timed past papers, and an early NEA start.

When are A-level Computer Science Paper 1 and Paper 2?

Both boards sit Paper 1 and Paper 2 in the same May/June exam series, in the same year, since all written exams are taken at the end of the course, in one series. What differs is the format, AQA's Paper 1 is on-screen, OCR's is written, which the table below breaks down in full. 

Exact 2027 dates haven't been published yet. Check AQA's or OCR's key dates page closer to the series.

How are the written papers structured?

Paper 1 and Paper 2 cover completely different content depending on which board you sit, right down to whether you're typing code or answering purely on paper.

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Here's how AQA and OCR structure their two written papers.

What is the NEA (Non-Exam Assessment)?

If you noticed that the table above only covers 80% of your final grade, that's because the two written papers leave out the remaining 20%: the Non-Exam Assessment. You'll work on this across Year 13, not in a single exam sitting, and submit it to a deadline your school or college sets ahead of the board's final date, so it's already marked before exam season starts. 

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Here's how each board structures the NEA, since it's marked as its own distinct component, not folded into either paper.

• AQA (Component 3): 75 marks, 20% of the A-level. Split into five sections: Analysis (9 marks), Documented design (12 marks), Technical solution (42 marks, made up of 15 for completeness of solution and 27 for techniques used), Testing (8 marks), and Evaluation (4 marks). Your technical solution alone carries more marks than the other four sections combined.
• OCR (Component 03 or 04, the "Programming Project"): 70 marks, 20% of the A-level. Split across Analysis (10 marks), Design (15 marks), Developing the coded solution (25 marks), and Evaluation (20 marks), with the coded solution alone carrying a quarter of your total mark, mirroring AQA's emphasis on the working solution over documentation. 

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Both boards use internal marking followed by external moderation. Your own teacher marks and annotates your project first, then an external moderator from the board checks a sample before your grade is confirmed, so what looks like coursework is actually externally verified. 

What are the assessment objectives (AO1-AO3)?

Every mark you earn on either board maps back to three assessment objectives, identical whether you sit AQA or OCR.

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Here's what each one measures.

• AO1: Knowledge and understanding. AQA's Paper 2 and OCR's Paper 1 lean heavily on this objective, which covers what you know about abstraction, logic, algorithms and data representation.
• AO2: Application. OCR's Paper 2 carries the most weight here, applying that knowledge to analyse problems in computational terms rather than simply stating facts back.
• AO3: Design, program and evaluate. Building a working system, then making reasoned judgements about it, sits almost entirely here, and it's where AQA's Paper 1 and your NEA on either board carry the most weight. OCR's own weighting table makes this concrete: your NEA is 0% AO1, 3% AO2, and 17% AO3.

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AQA and OCR test you through different papers, but never through different objectives. Which paper leans on which AO differs by board, even though the three AOs themselves stay the same. 

Is Computer Science one of the hardest A-levels?

Computer Science is frequently ranked among the hardest A-levels. In 2026, only 5.7% of OCR Computer Science students achieved an A*, and 7.9% of AQA's Computer Science entries achieved the top grade that year.

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What makes the subject difficult isn't just content volume. You're building two separate skill sets at once, theoretical knowledge like algorithms, data representation and computer architecture, plus practical programming ability that only shows up when your code actually runs.

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Abstract concepts like Big O notation and computational thinking demand genuine understanding rather than memorisation. Your NEA demands a working, functioning solution, not just documentation about one, leaving no room to fake proficiency you don't have. 

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How to get an A* in A-level Computer Science

Since Computer Science is demanding at the top end, hitting that A* comes down to a high overall percentage, not a fixed mark, as the two boards use different maximum totals.

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On AQA in 2026, you needed 314 out of 375, roughly 83.7%. On OCR, you needed 289 out of 350, around 82.6%. What differs is where those marks come from. OCR's own figures show its NEA carries almost no AO1 weight, so an A* still depends on strong performance across both written papers, not just a flawless project. 

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That balance across all three components is exactly what separates A* students from the rest. AQA students benefit from genuine on-screen programming practice under exam conditions, not just reading code. OCR students benefit from practising how to express algorithmic thinking accurately in written pseudocode. Both boards reward starting the NEA early enough to leave proper room for testing and evaluation. 

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Knowing what to focus on is one thing, actually doing it consistently is another. Our A-level Computer Science revision guide expands on each of these with board-specific detail.

Explore Computer Science with Immerse Education

Understanding how you're marked doesn't tell you whether Computer Science is worth pursuing beyond A-level. That's a harder question, and one your syllabus alone won't answer.

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Immerse Education's Computer Science Summer School gives you a university-style taste of the subject beyond the exam curriculum. Academic sessions cover models of computation, algorithms, object-oriented programming, AI and machine learning, and web development, taught by tutors who are faculty members at world-leading universities.

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You'll also complete a personal project, researching and presenting on a topic of your choosing, a different format from your NEA, but one that draws on the same independent thinking. 

FAQs

When is A-level Computer Science Paper 1?

Paper 1 is sat in the same May/June exam series as Paper 2, in the same year, since A-level Computer Science is a linear qualification. Exact 2027 dates follow AQA's or OCR's published timetable, released closer to the series.

Is the NEA marked externally?

Not directly. Your own teacher marks and annotates your project first, then an external moderator from the board checks a sample before your grade is confirmed, so the mark isn't left entirely in one teacher's hands.

How many marks is the NEA worth?

AQA's NEA is worth 75 marks, split across five sections. OCR's is worth 70 marks, across a similar five-stage structure. Both count for 20% of your final A-level grade regardless of board.

Do AQA and OCR assess Computer Science the same way?

Not paper by paper. AQA's Paper 1 is on-screen and involves coding, while OCR's two papers are both written theory. The three assessment objectives underneath both boards stay identical, only the route to each one differs.

Is Computer Science one of the hardest A-levels?

Yes, it's frequently ranked among the hardest. You're building two skill sets at once, theoretical knowledge and working programming ability, and abstract concepts like Big O notation don't reward memorisation the way essay-based subjects can.

How do you get an A* in A-level Computer Science?

In 2026, you needed 314 out of 375 on AQA and 289 out of 350 on OCR, both roughly 83%, though this boundary shifts slightly each year. Mastering the syllabus board by board, practising past papers under timed conditions, and starting your NEA early all help close that gap. 

Conclusion: understanding A-level Computer Science assessment

How A-level Computer Science is assessed comes down to three parts: two written papers worth 40% each, and an NEA worth 20%, though AQA and OCR test that content in genuinely different ways.

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The assessment objectives stay identical either way, and your NEA rewards a working solution far more than recall, something the AO weightings prove directly rather than leave to guesswork.

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Board-specific accuracy is what actually helps with revision planning, not generic advice that treats every exam board the same. Knowing exactly which paper tests what saves you from studying the wrong thing at the wrong time.

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Ready to take your interest in the subject further? Explore Immerse Education's Computer Science Summer School and get a university-style introduction to the parts of Computer Science your A-level doesn't have room for.