Methodology

This list is based on analysis of Pearson Edexcel IGCSE Science Double Award 4SD0 past papers (2019–2025), examiner reports and mark schemes. Science Double Award covers Biology, Chemistry and Physics; topics are ranked by frequency across the papers.

Top 10 most frequently tested topics

1. Cell structure and organisation (Biology)

Evidence: Cell structure, magnification. Examiner reports note structure and terminology errors.

Covers: cell structure; magnification; organelles; organisation.

2. Enzymes (Biology)

Evidence: Enzyme action, temperature, pH. Examiner reports highlight enzyme confusion.

Covers: enzyme action; effect of temperature and pH; denaturation.

3. Movement of substances (Biology)

Evidence: Diffusion, osmosis, active transport. Core biology.

Covers: diffusion; osmosis; active transport.

4. Electrolysis (Chemistry)

Evidence: Products at electrodes. Examiner reports note electrolysis errors.

Covers: electrolysis rules; products; aqueous solutions.

5. Acids, bases and salts (Chemistry)

Evidence: Neutralisation, titration. Core chemistry.

Covers: acids and bases; neutralisation; salt preparation.

6. Electricity and circuits (Physics)

Evidence: Current, voltage, resistance. Examiner reports note circuit and working errors.

Covers: series and parallel; Ohm’s law; circuit calculations.

7. Forces and motion (Physics)

Evidence: Force, acceleration, Newton’s laws. Core physics.

Covers: force; acceleration; Newton’s laws; graphs.

8. Organic chemistry (Chemistry)

Evidence: Alkanes, alkenes. Examiner reports note bonding and naming errors.

Covers: homologous series; alkanes, alkenes; reactions.

9. Respiration and gas exchange (Biology)

Evidence: Aerobic, anaerobic; gas exchange. Core biology.

Covers: respiration; gas exchange; lungs.

10. Energy and waves (Physics)

Evidence: Energy transfers; wave properties. Examiner reports note terminology.

Covers: energy; work; power; wave properties.

Revision priority

Enzymes, electrolysis and cell structure appear frequently. Show working and use precise terminology. See common mistakes.

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Sources: Edexcel past papers 2019–2025, examiner reports, specification.

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