How to Get an A* in A-Level Biology: An Examiner’s Perspective
After 25 years of teaching and examining A-Level Biology, I have watched hundreds of students achieve A* grades. Here is what actually separates them from everyone else — and it is not what most people think.
The Uncomfortable Truth About A* Grades
I am going to be honest with you from the start, because I think you deserve that.
In over 25 years of teaching A-Level Biology — 18 of those at Gower College Swansea, plus years of examining for WJEC/Eduqas and Edexcel — I have come to a conclusion that surprises most students: the difference between an A and an A* is rarely about knowing more biology.
That sounds wrong, I know. But think about it. Most students sitting at a high B or an A already have a solid understanding of the content. They know their enzymes from their antibodies. They can describe the light-dependent reaction. They understand meiosis.
What they cannot do — and this is the gap — is communicate that knowledge in the precise way that earns marks in an exam.
Nationally, only around 9–10% of A-Level Biology students achieve an A*. It has one of the lowest A*/A rates of any popular A-Level subject. In 2024, just 26% of Biology students achieved an A or above, compared with 31% in Chemistry and Physics, and 41% in Maths.
Those numbers are not there to discourage you. They are there so you understand that an A* requires a deliberate, strategic approach — not just hard work.
Here is what that approach looks like.
Strategy 1: Understand — Do Not Memorise
This is the single biggest difference I see between A* students and everyone else.
A-Level Biology has an enormous amount of content. The temptation is to memorise it — to learn it like a script. And it works, to a point. You can get a comfortable B, perhaps even an A, on memory alone.
But A* requires something different. It requires you to apply your knowledge to situations you have never seen before. And you cannot do that if all you have is a memorised script.
Here is a concrete example. A student who has memorised insulin might write:
| ✘ Memorised answer | ✔ Understood answer |
|---|---|
“Insulin lowers blood glucose levels.” Correct, but only worth 1 mark. No mechanism, no detail. | “Insulin binds to specific receptors on cell surface membranes, which triggers the insertion of GLUT4 channel proteins into the membrane, increasing the rate of glucose uptake into cells by facilitated diffusion.” This earns 3–4 marks because it shows the mechanism, uses precise terminology, and explains cause and effect. |
The difference is not that the second student knows more facts. It is that they understand how and why insulin works, not just what it does. When the exam throws them a novel context — say, a question about why a patient with damaged insulin receptors still has high blood glucose despite normal insulin levels — the student who understands can work it out. The student who memorised cannot.
Strategy 2: Make the Specification Your Roadmap
Every question on your exam paper comes from the specification. Every single one. There are no surprises — only topics you did not revise thoroughly enough.
I am always surprised by how few students have actually read their specification. Not the textbook — the specification itself. The textbook interprets the specification, and sometimes it includes material that will not be examined or misses nuances that will be.
Download your specification from your exam board’s website. Print it out. Go through it with a highlighter:
- Green for topics you are confident about
- Amber for topics you roughly understand but could not write a perfect answer on
- Red for topics that make you nervous
This gives you a revision map. Not a vague sense that you “need to revise biology,” but a specific, actionable list of exactly what needs work. The red topics get priority. The amber topics get refined. The green topics get a quick check every few weeks to make sure they stay green.
Your specification for the major boards is available here:
- AQA Biology (7402) — 8 topics, 3 papers, no multiple choice
- Edexcel A Biology (9BN0) — context-based, pre-released article
- OCR A Biology (H420) — strong on application, multiple choice in Papers 1 & 2
- WJEC Biology — unitised, optional topics, practical unit
- Eduqas Biology — linear, with optional topics
Strategy 3: Think Like an Examiner
This is where my experience as an examiner for WJEC/Eduqas and Edexcel gives me a perspective most tutors simply do not have.
When you sit an exam, you are not writing for a teacher. You are writing for an examiner who has a mark scheme in front of them and a pile of several hundred scripts to get through. That examiner is looking for specific marking points — and they are looking for them quickly.
Here is what most students do not realise:
Mark schemes are not suggestions
They are rigid. If the mark scheme says “active site is complementary to the substrate” and you write “the substrate fits into the active site,” you might not get the mark — even though you clearly understand the concept. The word complementary is what the examiner is looking for.
Examiners cannot give you the benefit of the doubt
If your answer is ambiguous, the examiner has to mark what you wrote, not what you meant. “The enzyme changes shape” could mean the active site becomes complementary (correct) or the enzyme denatures (incorrect). Precise language removes ambiguity.
One point per mark is the rule
A 6-mark question needs at least 6 distinct biological points. Writing beautifully about 3 points in great detail will earn you 3 marks, not 6. Breadth matters as much as depth.
Command words are instructions, not decorations
“Describe” means what happens. “Explain” means why it happens. “Suggest” means apply your knowledge to something unfamiliar. “Evaluate” means weigh up evidence and reach a conclusion. Getting this wrong costs students marks in every single exam session I have ever marked.
Strategy 4: Use Past Papers Properly
Everyone knows they should do past papers. Very few students actually use them effectively.
The most common mistake I see is this: a student sits a past paper, marks it, writes down their score, and moves on to the next one. They have “done” the paper, but they have not learned from it.
Here is how A* students use past papers differently:
Start untimed
Your first few papers should be done without time pressure. The goal is to practise how to answer, not to race. Speed comes later.
Mark ruthlessly
Use the mark scheme and be brutally honest. If your answer does not match the marking point, you did not earn that mark. Do not give yourself the benefit of the doubt — the examiner will not.
Analyse your mistakes
For every mark you dropped, identify why. Was it a content gap (you did not know the biology)? Was it a technique error (you knew the biology but did not express it correctly)? Or was it a question interpretation error (you answered a different question to the one asked)?
Redo papers you scored poorly on
After revising your weak areas, go back and redo the same paper. You should see improvement. If you do not, the revision method is not working.
One paper done thoroughly teaches you more than five papers rushed through. I would rather a student completed three past papers with full analysis than ten papers with just a score at the end.
You can find links to official past papers for your exam board on my resources page, along with topic-specific revision materials.
Struggling to Break Through to an A*?
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Book Free ConsultationStrategy 5: Get the Language Right
Biology mark schemes reward precise scientific terminology. This is non-negotiable at A* level.
Here are examples of the kind of language swaps that make the difference:
| ✘ Loses marks | ✔ Earns marks |
|---|---|
“The cell makes energy” | “Mitochondria produce ATP by oxidative phosphorylation” |
“Water moves into the cell” | “Water moves into the cell by osmosis, down a water potential gradient” |
“The enzyme is killed by heat” | “High temperatures cause the enzyme to denature; the tertiary structure changes so the active site is no longer complementary to the substrate” |
“DNA copies itself” | “DNA undergoes semi-conservative replication catalysed by DNA helicase and DNA polymerase” |
“Antibodies fight the pathogen” | “Antibodies bind to antigens on the pathogen surface, forming antigen-antibody complexes, leading to agglutination” |
Every one of those left-column answers shows understanding. But in an exam, the left column earns 0–1 marks and the right column earns 2–3 marks. Over a full paper, that difference adds up to entire grades.
Strategy 6: Attack Your Weak Areas First
This is psychologically the hardest strategy, and it is one of the most important.
Every student has topics they enjoy revising. They are the topics you already understand well — they feel productive because you can answer the questions. But revising what you already know is the least efficient use of your time.
A* students do the opposite. They identify their weakest topics — the ones where they consistently drop marks — and they prioritise those. It is uncomfortable. It feels slow. But every mark you gain from improving a weak area is a mark that would otherwise be lost in the exam.
The topics that most commonly trip students up across all exam boards include:
- Gene expression and regulation — epigenetics, transcription factors, post-translational modification
- Respiration biochemistry — the link reaction, Krebs cycle, oxidative phosphorylation in detail
- Photosynthesis — particularly the Calvin cycle and limiting factors
- Statistics — chi-squared tests, standard deviation, Hardy-Weinberg equilibrium
- Ecological concepts — succession, population dynamics, data interpretation
- Synoptic questions — linking concepts across different topic areas
If you are unsure where your weaknesses lie, there is a simple test: try answering exam questions on each topic without your notes. The topics where you stall or produce vague answers are the ones that need work. I have free revision resources covering many of the core A-Level Biology topics that can help.
Board-Specific Advice for A* Candidates
While the strategies above apply to every exam board, there are specific things you should focus on depending on which specification you are studying.
AQA (7402)
The 25-mark synoptic essay in Paper 3 is your biggest opportunity and your biggest risk. It is worth over 30% of that paper. The most common mistake is writing in depth about one or two topics instead of drawing on five or more areas of the specification. Practise essay plans: aim for 10 paragraphs covering 5 different topic areas, each with a factual paragraph and an application paragraph. For more detail, see my AQA A-Level Biology page.
Edexcel A (Salters-Nuffield, 9BN0) and Edexcel B (9BI0)
The pre-released article for Paper 3 is released approximately eight weeks before the exam. Use that time well. Do not just read the article — annotate it with relevant biological concepts from across your specification. The exam will test your ability to apply knowledge to the article’s context, not to recall the article itself. Visit my Edexcel A or Edexcel B pages for more.
OCR A (H420)
OCR places heavy emphasis on application to unfamiliar contexts. You will be given data, diagrams, or scenarios you have never encountered and asked to apply biological principles. Practise this skill specifically — do not just revise content in isolation. My OCR A Biology page has more guidance.
WJEC and Eduqas
These are the only boards offering optional topics — make sure you are playing to your strengths. The Quality of Extended Response (QER) questions require a structured, logical answer with a clear scientific argument. Having examined for WJEC/Eduqas myself, I can tell you that the most common issue is students who write everything they know rather than constructing a focused, well-reasoned response. See my WJEC and Eduqas pages.
For a detailed comparison of all exam boards — including paper structures, grade boundaries, and which board suits different strengths — see my AQA vs Edexcel vs OCR comparison guide.
A Realistic Timeline to A*
Students often ask me, “How long does it take to get an A*?” There is no single answer, but here is a realistic timeline for a student currently sitting at a B or high C who is willing to put in consistent work.
Weeks 1–4: Audit and understand
Go through the specification with your highlighter. Identify every red and amber topic. Start working through these with a focus on understanding, not memorising. Use your textbook, videos, and — if you have one — a tutor to build genuine comprehension.
Weeks 5–10: Active recall and practice
Start testing yourself. Use flashcards for terminology, but primarily use exam questions — by topic, untimed. Mark with the mark scheme. Build a “mistake log” of recurring errors.
Weeks 11–16: Full papers under timed conditions
Now add time pressure. Do full past papers, mark them, analyse every dropped mark. Aim for 75%+ consistently. If you are not there, revisit the weak areas.
Final 2–4 weeks: Refinement
Focus on precision. Revisit mark scheme language. Redo papers you previously scored poorly on. Practise synoptic questions that link multiple topics. Trust your preparation.
This is not a guarantee — nothing is. But students who follow this kind of structured approach, consistently, are the ones I see achieving A* grades year after year.
The Bottom Line
An A* in A-Level Biology is not reserved for the naturally gifted. It is earned by students who combine solid content knowledge with precise exam technique, consistent practice, and an honest awareness of their own weaknesses.
The strategies in this article are not theoretical — they are drawn from 25 years of watching students succeed and fail, and from marking thousands of exam scripts. They work. But they require honesty, consistency, and effort.
If you are aiming for an A* and want expert support — someone who has sat on the other side of the mark scheme and knows exactly what examiners are looking for — I offer one-to-one online tuition and small group sessions covering all major exam boards. You can also book a free 20-minute consultation to discuss where you are and what would help most.
Frequently Asked Questions
A* boundaries vary by exam board and year, but typically fall between 69% and 76% of total marks. For AQA in 2024, the A* boundary was 73.8% (192 out of 260 marks). For Edexcel A in 2025, it was 75% (225 out of 300). Boundaries shift each year depending on paper difficulty, so rather than targeting a specific percentage, aim to consistently score 75%+ in practice papers to give yourself a comfortable margin.
Only around 9–10% of students achieve an A* nationally, making it one of the harder A-Levels to get top marks in. However, this is largely because students underestimate the importance of exam technique alongside content knowledge. Students who master both — understanding the biology and knowing how to write answers that earn marks — consistently achieve A* grades.
Yes — it happens more often than people think. In over 25 years of teaching and tutoring, I have seen students make this jump. The key is identifying whether the gap is in content knowledge, exam technique, or both. Many students scoring Cs actually know more biology than their grade suggests — they lose marks through imprecise language, poor question interpretation, or ineffective revision methods. Targeted work on these areas can produce rapid improvement.
There is no magic number of hours. What matters far more is how you revise. Two hours of active recall and past paper practice is worth more than six hours of re-reading notes. As a general guideline, most A* students do around 1–2 hours of biology revision per day during Year 13, increasing to 2–3 hours in the final weeks before exams. Consistency matters more than volume.
Not necessarily — but the right tutor can make a significant difference, particularly if you are struggling to move from a B to an A/A*. The value of a tutor lies in expert feedback on your exam answers, identification of gaps you may not recognise yourself, and teaching you to think like an examiner. A tutor with examining experience can show you exactly where and why students lose marks, which is difficult to learn from textbooks alone.
None — Ofqual ensures comparable outcomes across all exam boards. If one board has lower grade boundaries, it means their papers were harder, not easier. The real question is which exam style suits your strengths. AQA rewards precise recall and strong essay writing. OCR tests application to unfamiliar contexts. Edexcel uses a pre-released article. WJEC/Eduqas offers optional topic choice. See my detailed board comparison for more.
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Disclaimer: The information provided on this page is intended for educational guidance only. While every effort has been made to ensure accuracy, Biology Education and its author accept no responsibility for individual exam outcomes. Students are advised to consult their own teachers, tutors, and official exam board resources as part of their revision. Grade boundary data is sourced from official exam board publications.