Cambridge IGCSE · 0654 · Data 2020–2025
Most-tested topics in IGCSE Co-ordinated Sciences
Just 3 chapters — Motion, forces and energy, Atoms, elements and compounds, Electricity and magnetism — carry about 27% of all the marks. Revise those first.
Based on 238 real Cambridge past papers and 46,564 tagged marks, 2020–2025. Ranked by marks, not guesswork.
Historical counts from past papers — not an exam prediction. Download the data (CSV)
Revise these first
The topics that carry the most marks, highest first. Each opens the free past-paper questions.
- 1Practise →P1.6 Energy, work and power3% of marksMotion, forces and energyEvery year
- 2Practise →P4.3 Electrical circuits3% of marksElectricity and magnetismEvery year
- 3Practise →C12.1 Experimental design3% of marksExperimental techniques and chemical analysisEvery year
- 4Practise →P4.2 Electrical quantities3% of marksElectricity and magnetismEvery year
- 5Practise →P1.5 Forces3% of marksMotion, forces and energyEvery year
- 6Practise →Motion, forces and energyEvery year
- 7Practise →Acids, bases and saltsEvery year
- 8Practise →P1.2 Motion2% of marksMotion, forces and energyEvery year
See the full breakdown — all 112 topics across 37 chapters
Motion, forces and energy
13% of marks- P1.6 Energy, work and powerEvery year1329 marks · 227 qs
- P1.5 ForcesEvery year1187 marks · 206 qs
- P1.1 Physical quantities and measurement techniquesEvery year1121 marks · 123 qs
- P1.2 MotionEvery year1053 marks · 150 qs
- P1.4 DensityEvery year743 marks · 99 qs
- P1.3 Mass and weightEvery year363 marks · 46 qs
- P1.7 PressureEvery year219 marks · 42 qs
Atoms, elements and compounds
7% of marks- C2.5 Simple molecules and covalent bondsEvery year862 marks · 136 qs
- C2.2 Atomic structure and the Periodic TableEvery year752 marks · 110 qs
- C2.4 Ions and ionic bondsEvery year699 marks · 99 qs
- C2.1 Elements, compounds and mixturesEvery year447 marks · 84 qs
- C2.3 IsotopesEvery year402 marks · 71 qs
- C2.6 Giant covalent structuresEvery year232 marks · 29 qs
- C2.7 Metallic bondingEvery year94 marks · 12 qs
Electricity and magnetism
7% of marks- P4.3 Electrical circuitsEvery year1254 marks · 220 qs
- P4.2 Electrical quantitiesEvery year1190 marks · 168 qs
- P4.5 Electromagnetic effectsEvery year402 marks · 109 qs
- P4.1 Simple phenomena of magnetismEvery year273 marks · 78 qs
- P4.4 Electrical safetyEvery year137 marks · 63 qs
Waves
6% of marks- P3.2 LightEvery year860 marks · 172 qs
- P3.3 Electromagnetic spectrumEvery year722 marks · 92 qs
- P3.4 SoundEvery year587 marks · 97 qs
- P3.1 General properties of wavesEvery year508 marks · 91 qs
Organic chemistry
6% of marks- C11.4 AlkanesEvery year605 marks · 91 qs
- C11.5 AlkenesEvery year584 marks · 86 qs
- C11.3 FuelsEvery year404 marks · 97 qs
- C11.1 Formulas and terminologyEvery year390 marks · 46 qs
- C11.7 PolymersEvery year272 marks · 74 qs
- C11.6 AlcoholsEvery year257 marks · 43 qs
- C11.2 Naming organic compoundsEvery year156 marks · 26 qs
Experimental techniques and chemical analysis
6% of marks- C12.1 Experimental designEvery year1233 marks · 128 qs
- C12.5 Identification of ions and gasesEvery year785 marks · 132 qs
- C12.4 Separation and purificationEvery year309 marks · 64 qs
- C12.3 ChromatographyEvery year155 marks · 28 qs
- C12.2 Acid-base titrationsRecurring102 marks · 7 qs
Thermal physics
4% of marks- P2.3 Transfer of thermal energyEvery year960 marks · 159 qs
- P2.1 Kinetic particle model of matterEvery year651 marks · 100 qs
- P2.2 Thermal properties and temperatureEvery year421 marks · 70 qs
Metals
4% of marks- C9.6 Extraction of metalsEvery year423 marks · 77 qs
- C9.4 Reactivity seriesEvery year415 marks · 69 qs
- C9.3 Alloys and their propertiesEvery year414 marks · 62 qs
- C9.1 Properties of metalsEvery year262 marks · 41 qs
- C9.5 Corrosion of metalsEvery year220 marks · 30 qs
- C9.2 Uses of metalsRecurring107 marks · 26 qs
Chemical reactions
4% of marks- C6.2 Rate of reactionEvery year990 marks · 149 qs
- C6.1 Physical and chemical changesEvery year409 marks · 75 qs
- C6.3 RedoxEvery year296 marks · 87 qs
Acids, bases and salts
3% of marks- C7.1 The characteristic properties of acids and basesEvery year1055 marks · 195 qs
- C7.3 Preparation of saltsEvery year268 marks · 47 qs
- C7.2 OxidesEvery year75 marks · 31 qs
Stoichiometry
3% of marks- C3.3 The mole and the Avogadro constantEvery year600 marks · 77 qs
- C3.1 FormulasEvery year501 marks · 65 qs
- C3.2 Relative masses of atoms and moleculesEvery year124 marks · 14 qs
Human nutrition
2% of marks- B7.3 DigestionEvery year437 marks · 73 qs
- B7.1 DietEvery year419 marks · 72 qs
- B7.2 Digestive systemEvery year288 marks · 55 qs
Reproduction
2% of marks- B15.3 Sexual reproduction in plantsEvery year394 marks · 65 qs
- B15.4 Sexual reproduction in humansEvery year305 marks · 59 qs
- B15.2 Sexual reproductionEvery year165 marks · 33 qs
- B15.1 Asexual reproductionEvery year163 marks · 37 qs
- B15.5 Sexually transmitted infectionsRecurring40 marks · 4 qs
The Periodic Table
2% of marks- C8.2 Group I propertiesEvery year275 marks · 61 qs
- C8.4 Transition elementsEvery year263 marks · 56 qs
- C8.3 Group VII propertiesEvery year221 marks · 51 qs
- C8.1 Arrangement of elementsEvery year166 marks · 27 qs
- C8.5 Noble gasesEvery year141 marks · 40 qs
Nuclear physics
2% of marks- P5.2 RadioactivityEvery year809 marks · 149 qs
- P5.1 The nucleusEvery year249 marks · 42 qs
Transport in animals
2% of marks- B9.4 BloodEvery year444 marks · 52 qs
- B9.3 Blood vesselsEvery year231 marks · 34 qs
- B9.1 Circulatory systemsEvery year222 marks · 39 qs
- B9.2 HeartEvery year140 marks · 23 qs
Plant nutrition
2% of marks- B6.1 PhotosynthesisEvery year699 marks · 154 qs
- B6.2 Leaf structureEvery year318 marks · 45 qs
Coordination and response
2% of marks- B13.1 Coordination and responseEvery year443 marks · 83 qs
- B13.2 HormonesEvery year322 marks · 58 qs
- B13.3 HomeostasisEvery year218 marks · 42 qs
Transport in plants
2% of marks- B8.1 Xylem and phloemEvery year287 marks · 48 qs
- B8.3 TranspirationEvery year245 marks · 57 qs
- B8.2 Water uptakeEvery year235 marks · 28 qs
- B8.4 TranslocationRecurring131 marks · 21 qs
Cells
2% of marks- B2.1 Cell structureEvery year462 marks · 82 qs
- B2.2 Size of specimensEvery year419 marks · 49 qs
Biological molecules
2% of marks- B4.1 Biological moleculesEvery year859 marks · 169 qs
Chemical energetics
2% of marks- C5.1 Exothermic and endothermic reactionsEvery year826 marks · 139 qs
Chemistry of the environment
2% of marks- C10.2 Air quality and climateEvery year621 marks · 125 qs
- C10.1 WaterEvery year199 marks · 42 qs
Organisms and their environment
1% of marks- B18.2 Food chains and food websEvery year332 marks · 96 qs
- B18.1 Energy flowEvery year185 marks · 48 qs
- B18.3 Carbon cycleEvery year128 marks · 42 qs
Inheritance
1% of marks- B16.1 Chromosomes and genesEvery year269 marks · 56 qs
- B16.3 Monohybrid inheritanceEvery year206 marks · 49 qs
- B16.2 Cell divisionEvery year161 marks · 25 qs
Electrochemistry
1% of marks- C4.1 ElectrolysisEvery year593 marks · 137 qs
- C4.2 Hydrogen–oxygen fuel cellsOne-off32 marks · 3 qs
Enzymes
1% of marks- B5.1 EnzymesEvery year624 marks · 141 qs
Movement into and out of cells
1% of marks- B3.2 OsmosisEvery year345 marks · 56 qs
- B3.1 DiffusionEvery year216 marks · 34 qs
- B3.3 Active transportRecurring40 marks · 5 qs
Respiration
1% of marks- B12.1 RespirationEvery year589 marks · 113 qs
States of matter
1% of marks- C1.1 Solids, liquids and gasesEvery year379 marks · 52 qs
- C1.2 DiffusionEvery year91 marks · 12 qs
Variation and selection
1% of marks- B17.2 SelectionEvery year215 marks · 37 qs
- B17.1 VariationEvery year172 marks · 31 qs
Human influences on ecosystems
1% of marks- B19.1 Habitat destructionEvery year233 marks · 56 qs
- B19.2 ConservationRecurring117 marks · 15 qs
Characteristics of living organisms
1% of marks- B1.1 Characteristics of living organismsEvery year306 marks · 92 qs
Gas exchange in humans
1% of marks- B11.1 Gas exchange in humansEvery year302 marks · 80 qs
Diseases and immunity
0% of marks- B10.1 Diseases and immunityEvery year194 marks · 22 qs
Space physics
0% of marks- P6.2 Stars and the UniverseOne-off103 marks · 16 qs
- P6.1 The Solar SystemRecurring89 marks · 21 qs
Drugs
0% of marks- B14.1 DrugsEvery year108 marks · 13 qs
Turn the data into practice
Every topic above is drawn from real Cambridge IGCSE Co-ordinated Sciences papers, tagged to the syllabus. Students can drill the high-frequency topics in the free bank; teachers can turn any of them into a ready-to-print worksheet in seconds. Or explore the full six-year trends in the interactive records.