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This lesson breaks down the structure of the Edexcel GCSE Combined Science examination (specification code 1SC0). Understanding the layout of each paper, how marks are distributed and how to manage your time is the first step to maximising your grade.
Edexcel GCSE Combined Science is examined across six papers — two for each science discipline. Together they contribute to a combined double award (worth two GCSEs, graded 9-9 to 1-1).
| Paper | Subject | Topics covered | Duration | Total marks |
|---|---|---|---|---|
| Paper 1 | Biology | Topics 1–5 (Key Concepts in Biology, Cells and Control, Genetics, Natural Selection and Genetic Modification, Health, Disease and the Development of Medicines) | 1 h 10 min | 60 |
| Paper 2 | Biology | Topics 6–9 (Plant Structures and their Functions, Animal Coordination, Control and Homeostasis, Exchange and Transport in Animals, Ecosystems and Material Cycles) | 1 h 10 min | 60 |
| Paper 3 | Chemistry | Topics 1–5 (Key Concepts in Chemistry, States of Matter and Mixtures, Chemical Changes, Extracting Metals and Equilibria, Separate Chemistry 1) | 1 h 10 min | 60 |
| Paper 4 | Chemistry | Topics 6–9 (Groups in the Periodic Table, Rates of Reaction and Energy Changes, Fuels and Earth Science, Separate Chemistry 2) | 1 h 10 min | 60 |
| Paper 5 | Physics | Topics 1–7 (Key Concepts of Physics, Motion and Forces, Conservation of Energy, Waves, Light and the EM Spectrum) | 1 h 10 min | 60 |
| Paper 6 | Physics | Topics 8–15 (Radioactivity, Astronomy, Energy — Physics, Forces and their Effects, Electricity and Circuits, Static Electricity, Magnetism and the Motor Effect, Electromagnetic Induction) | 1 h 10 min | 60 |
Exam Tip: Each paper is worth exactly 60 marks and lasts exactly 1 hour 10 minutes (70 minutes). That gives you a simple rule of thumb — roughly one mark per minute, with 10 minutes spare for checking.
Every question on every paper is linked to one of three Assessment Objectives (AOs). Understanding what each AO expects helps you pitch your answer at the right level.
| AO | Description | Approximate weighting |
|---|---|---|
| AO1 | Demonstrate knowledge and understanding of scientific ideas, processes, techniques and procedures | 40% |
| AO2 | Apply knowledge and understanding of scientific ideas, processes, techniques and procedures (including in new contexts) | 40% |
| AO3 | Analyse information and ideas to interpret and evaluate; make judgements and draw conclusions; develop and improve experimental procedures | 20% |
Exam Tip: Around 20% of the marks across all papers are for mathematics (calculations, graph interpretation, data handling). Practise these skills regularly — they are not optional.
Each paper uses a mixture of question types:
| Question type | Description | Marks |
|---|---|---|
| Multiple choice | Select one answer from four options | 1 |
| Short answer | A few words or a sentence | 1–3 |
| Calculations | Show full working; give the answer with correct units | 2–4 |
| Extended open response | Write a structured, detailed answer | 6 |
Each paper typically includes at least one 6-mark extended response question (sometimes two). These use levels-based marking — see Lesson 3 for a full breakdown of how to approach them.
With 60 marks in 70 minutes you have approximately 1 minute per mark plus 10 minutes spare. Here is a recommended approach:
flowchart LR
A["Start: read the paper<br/>(2 min)"] --> B["Answer Section A<br/>in order (50 min)"]
B --> C["Tackle the 6-mark<br/>question (8–10 min)"]
C --> D["Check & review<br/>(remaining time)"]
Exam Tip: Never leave a multiple-choice question blank. If you are unsure, eliminate obviously wrong answers and make your best guess — there is no penalty for wrong answers.
A common mistake is revising "Biology" without knowing which topics appear on which paper. Use the table below to focus your revision.
| Discipline | Paper 1 topics | Paper 2 topics |
|---|---|---|
| Biology | Key Concepts, Cells and Control, Genetics, Natural Selection, Health and Disease | Plant Structures, Animal Coordination, Exchange and Transport, Ecosystems |
| Chemistry | Key Concepts, States of Matter, Chemical Changes, Extracting Metals | Groups in the Periodic Table, Rates of Reaction, Fuels and Earth Science |
| Physics | Key Concepts, Motion and Forces, Conservation of Energy, Waves and EM Spectrum | Radioactivity, Astronomy, Energy, Electricity, Static Electricity, Magnetism |
Exam Tip: Make a checklist for each paper. Tick off topics as you revise them. This prevents the common trap of over-revising favourite topics and neglecting weaker areas.
Your raw marks across all six papers are totalled and converted into a grade on the 9-9 to 1-1 scale. The grade boundaries change each year, but as a rough guide:
Although you do not sit a separate practical exam, core practical questions appear on every paper. You must know:
These are covered in detail in Lessons 7, 8 and 9.
Exam Tip: Around 15% of the total marks assess knowledge of practical procedures. Learn the core practicals thoroughly — you cannot avoid them.
As noted above, at least 20% of marks require mathematical skills. Key areas include:
| Skill | Examples |
|---|---|
| Arithmetic and numerical computation | Percentages, ratios, fractions |
| Handling data | Mean, median, mode, range, significant figures |
| Algebra | Rearranging equations, substituting values |
| Graphs | Plotting, reading values, calculating gradients, area under a curve |
| Geometry and trigonometry | Angles (reflection, refraction), scale diagrams |