OCR GCSE Biology A: Gateway Science (J247): complete guide to the six topics, the practical skills and the exams

OCR GCSE Biology A: Gateway Science (specification J247) is a single GCSE worth one grade from 9 to 1. It is a linear course assessed by two written papers at the end of the course, with no coursework, though practical skills are examined in both papers. This page is the index: below is a map of the six topics, the exam structure, the tiers, and how to study each one.

The six Biology A topics

The content is organised into six topics (B1 to B6), plus a practical skills topic B7 that is assessed inside the written papers. Each topic has an overview guide here, and each overview links to a focused answer page for every specification statement.

B1 Cell level systems

Eukaryotic and prokaryotic cells, microscopy and magnification, DNA and protein synthesis, enzymes, respiration and photosynthesis. Start with the Cell level systems overview.

B2 Scaling up

The cell cycle and mitosis, stem cells, diffusion, osmosis and active transport, surface area to volume ratio, exchange surfaces, the circulatory system and transport in plants. Start with the Scaling up overview.

B3 Organism level systems

The nervous system and reflexes, the brain and the eye, the endocrine system, control of blood glucose, hormones in reproduction and plant hormones. Start with the Organism level systems overview.

B4 Community level systems

Ecosystems and interdependence, food chains, webs and predator-prey cycles, sampling with quadrats and transects, the carbon and water cycles, and the nitrogen cycle and decomposition. Start with the Community level systems overview.

B5 Genes, inheritance and selection

Reproduction and meiosis, DNA, the genome and variation, genetic inheritance and Punnett squares, inherited disorders, evolution by natural selection, and selective breeding and genetic engineering. Start with the Genes, inheritance and selection overview.

B6 Global challenges

Pathogens and communicable disease, preventing and treating disease, monoclonal antibodies, non-communicable diseases and risk factors, monitoring and maintaining biodiversity, and feeding the human race. Start with the Global challenges overview.

Exam structure

Biology A is assessed by two written papers, both sat at the end of the course at one tier. Each paper is 1 hour 45 minutes, worth 90 marks, and 50% of the GCSE. A calculator is allowed in both.

• Foundation tier sits J247/01 (topics B1 to B3 and B7) and J247/02 (topics B4 to B6 and B7).
• Higher tier sits J247/03 (topics B1 to B3 and B7) and J247/04 (topics B4 to B6 and B7).

The second paper of each pair (J247/02 and J247/04) assumes knowledge of B1 to B3 and includes synoptic questions that link ideas across the whole course. Every paper also assesses the B7 practical skills. At least 10% of marks assess maths skills, and at least 15% assess practical activities and practical skills.

Foundation and Higher tiers

The qualification is tiered, and you sit both of your papers at one tier.

• Foundation tier targets grades 1 to 5 and covers the core content of all six topics.
• Higher tier targets grades 4 to 9 and adds the more demanding content, such as the detailed structure of the eye, the role of glucagon, harder genetic crosses, and monoclonal antibodies.

The tier you enter sets the maximum grade you can be awarded, so choose with your teacher based on your target grade.

Practical activity groups (PAGs)

There is no separate practical exam, but topic B7 Practical skills requires you to complete at least eight practical activities drawn from the biology practical activity groups (PAGs B1 to B7). These cover microscopy and biological drawing, enzyme activity, osmosis and transport, photosynthesis and gas exchange, response and homeostasis (such as reaction time), ecology fieldwork with quadrats and transects, and microbiology (such as the effect of antiseptics on bacteria). Questions across both papers test the methods, the apparatus and techniques, and how to handle data and uncertainties.

How to study Biology A

Biology A rewards precise recall, links between structure and function, and confident data handling.

1. Work from the specification statements. Each numbered point is a checklist; questions are written from them.
2. Learn definitions precisely. Mark schemes reward exact wording for terms like diffusion, homeostasis, allele and biodiversity.
3. Drill the maths. Magnification, surface area to volume ratio, percentage change and genetic ratios all appear.
4. Master the PAG methods. Microscopy, osmosis, photosynthesis, reaction time and ecology fieldwork recur across both papers.
5. Practise six-mark questions. Extended responses reward a logical, well-linked argument and the right OCR command word response.

For the official specification

OCR publishes the full specification (J247), past papers and mark schemes at ocr.org.uk. Always revise from the current specification and OCR's own past papers, because question style is board-specific.