A complete guide to Edexcel GCSE Biology

Edexcel GCSE Biology (specification 1BI0) is the second most popular biology GCSE in the UK after AQA, run by Pearson Edexcel. It is a linear qualification, structured around nine topics and assessed across two written papers at the end of Year 11.

This guide covers everything you need to know to walk into the exam confident: How the papers are structured, which topics are tested on each, the core practicals you have to know, and the revision techniques that work best for biology.

Edexcel GCSE Biology is a linear qualification. Everything you have learned over Years 10 and 11 is assessed at the end of the course in one exam series, usually in May and June of Year 11. There is no coursework and no controlled assessment. Your grade comes entirely from two written papers.

Both papers are weighted equally and test the same three assessment objectives: Recall of biological knowledge, application of that knowledge to unfamiliar contexts, and analysis of practical and experimental data.

Each paper contains a mix of question types: Multiple choice, short structured answers, longer six-mark extended response questions, and questions that ask you to interpret graphs, tables, or unfamiliar data. The six-mark questions are where the top grades are decided. Examiner reports flag them as the discriminator between a grade 7 and a grade 9.

Paper 1 is sat first in the summer exam series. It covers topics 1 to 5: The fundamentals of biology, cells, genetics, evolution, and health, disease and the development of medicines.

The foundations of biology. You cover cell structure (prokaryotic and eukaryotic), specialised cells, microscopy and magnification, enzymes, and transport across membranes (diffusion, osmosis, active transport). Topic 1 also appears in Paper 2, which makes it the most important topic to nail early.

Mitosis, the cell cycle, stem cells, and growth in plants and animals. You learn about percentile charts, growth measurement, and the nervous system, including reflex arcs and the structure of the eye and brain.

Meiosis, DNA structure, monohybrid inheritance, and sex determination. You cover Mendel's experiments, genetic disorders, and variation. Higher Tier extends to protein synthesis and the human genome project.

Evolution by natural selection, the evidence for evolution (including fossils and antibiotic resistance), classification, selective breeding, genetic engineering, and tissue culture. You also study Darwin and Wallace's contributions to evolutionary theory.

Pathogens (bacterial, viral, fungal, protist), the immune system, vaccines, antibiotics, and how new drugs are developed and tested. Higher Tier covers monoclonal antibodies and their uses in diagnosis and treatment.

Paper 2 covers topics 6 to 9, plus revisits of topic 1. The content focuses on whole-organism biology, ecology, and the cycles that keep ecosystems running.

Photosynthesis, limiting factors, plant transport (xylem and phloem), and plant hormones such as auxins and gibberellins. You also study leaf structure and stomatal opening.

Hormones, the menstrual cycle, contraception, blood glucose regulation (including diabetes types 1 and 2), thyroxine, adrenaline, and thermoregulation.

The heart, blood vessels, the lungs, and gas exchange. You cover the structure and function of red and white blood cells, plasma, and platelets.

Food chains, energy transfer through ecosystems, the water cycle, the carbon cycle, the nitrogen cycle, biodiversity, and human impacts including climate change and pollution.

Edexcel specifies 8 core practicals you must have carried out (or seen demonstrated) during the course. You will not perform them in the exam, but you will be tested on the methods, the variables, the results, and the underlying biology. Around 15% of the marks across the two papers come from practical-related questions.

These are the 8 core practicals you need to know:

Edexcel GCSE Biology is tiered. Foundation Tier covers grades 1–5 and Higher Tier covers grades 4–9. The same content appears on both tiers, but Higher Tier papers contain harder questions and additional Higher-only content (such as monoclonal antibodies in topic 5 and parts of protein synthesis in topic 3).

Your school usually decides which tier you sit, based on mock exam results and class assessments. If you sit Foundation and score above the boundary for grade 5, you will be awarded a 5. If you sit Higher and score below the grade 4 boundary, you will be ungraded (U), with no safety net of a grade 3.

Grade boundaries change every year. Pearson publishes the official boundaries on results day each August.

Biology has a reputation for being a memorise-it subject, and to a point that is true. But the students who get grade 8 and 9 do not just memorise. They learn how to apply biology to unfamiliar contexts, which is what Edexcel tests heavily.

Reading your notes feels productive but barely sticks. Active recall – closing the book and writing everything you remember – forces your brain to retrieve information, which is what builds long-term memory. Flashcards, blurting, and self-testing all work. The Cognito quiz system is built around this principle.

Do not just learn each method. Learn the kinds of questions examiners ask. What are the variables? Why is each control variable important? What would happen if you changed the method in this specific way? Past paper questions on practicals are some of the most predictable mark-grabbers in the exam.

Six-mark extended responses are where Higher Tier candidates earn the difference between a 7 and a 9. Practise writing them in three minutes each. Plan with a quick bullet list before you write the prose. Use mark schemes to learn exactly which points examiners reward.

Genetics questions are nearly free marks if your notation is tidy. Draw a clear Punnett square, label the alleles, and write the genotypes and phenotypes of offspring. Examiners reward correct working even when the final answer is wrong, so always show your reasoning.

Doing a past paper and putting it away is wasted work. Mark it honestly, write down every topic you got wrong, and revise that specific content before doing another paper. The biggest score jumps come between paper 3 and paper 8, when you start revising your weaknesses rather than just doing more papers.