A complete guide to Cambridge IGCSE Co-ordinated Sciences (0654)

Cambridge IGCSE Co-ordinated Sciences (Double Award) 0654 is the international equivalent of GCSE Combined Science. It earns two IGCSE grades, and is distinct from the single-award Cambridge IGCSE Combined Science 0653, which earns just one. This guide covers the 0654 Double Award route because it is by far the more common choice at international schools and the closest match to UK GCSE Combined Science.

The qualification covers biology, chemistry, and physics in a single integrated course. It is fully linear, exam-only, and structured to be taught alongside more advanced subjects in a packed timetable. Here we walk through everything you need to know to sit the exam with confidence.

Co-ordinated Sciences is fully linear. All papers are sat at the end of the course, in either May/June or October/November. There is no coursework and no controlled assessment.

The qualification is tiered into Core and Extended. The Core route uses easier papers and gives access to paired grades CC to GG. The Extended route covers all of Core plus additional Extended-only content across all three sciences, and formally assesses paired grades AA to GG. Extended is intended for stronger candidates expected to achieve grade CC or above. Your school decides which route to enter you for based on mock performance.

Co-ordinated Sciences covers a substantial chunk of the single-subject Cambridge IGCSE specs (0610 Biology, 0620 Chemistry, 0625 Physics) but with reduced depth in some areas to fit three sciences into a single qualification.

B1 Characteristics of living organisms; B2 Cells; B3 Movement into and out of cells; B4 Biological molecules; B5 Enzymes; B6 Plant nutrition; B7 Human nutrition; B8 Transport in plants; B9 Transport in animals; B10 Diseases and immunity; B11 Gas exchange in humans; B12 Respiration; B13 Coordination and response; B14 Drugs; B15 Reproduction; B16 Inheritance; B17 Variation and selection; B18 Organisms and their environment; B19 Human influences on ecosystems.

States of matter, atoms and elements, stoichiometry, electrochemistry, chemical energetics, rates and equilibrium, acids and bases, the periodic table, metals, chemistry of the environment, organic chemistry, and experimental techniques.

1. Motion, forces and energy; 2. Thermal physics; 3. Waves (including light and sound); 4. Electricity and magnetism (including electromagnetism); 5. Nuclear physics; 6. Space physics.

Co-ordinated Sciences includes a practical component (Paper 5 practical test or Paper 6 alternative to practical). Check the latest 0654 assessment overview for the exact weighting in the syllabus you are sitting. Both Paper 5 and Paper 6 test the same skills and carry the same weighting as one another.

A 2 hour practical exam sat in a lab. You will rotate through tasks covering biology, chemistry, and physics, recording observations, taking measurements, plotting graphs, and answering questions on method. It is marked out of 60.

A 1 hour 30 minute written paper that tests the same practical skills as Paper 5 without any physical lab work. You answer questions on apparatus, methods, observations, and graph drawing using data provided in the paper.

Many international schools enter their candidates for Paper 6 because it is logistically simpler than running a rotating lab exam. Both options assess the same skills and are worth the same weighting.

Co-ordinated Sciences is graded as a pair (for example CC, BB, AA). The Core route gives access to paired grades CC to GG only. The Extended route formally assesses paired grades AA to GG; Extended is for stronger candidates expected to achieve CC or above.

Most academically strong students take Extended because it unlocks higher grades. Your school will normally make the route decision based on mocks.

Grade boundaries shift every series and are published by Cambridge on results day each August and January.

Co-ordinated Sciences covers three subjects in the time most students would normally give to one or two. The students who get A*/A* are not necessarily the strongest in any single science, but they are the most organised and consistent across all three.

Do not block-revise one science for two weeks and then move on. By the time you come back to it the content will have decayed. Rotate biology, chemistry, and physics across the week so that each gets touched at least twice.

Ion tests in chemistry and equations in physics are the two highest-yield pieces of pure recall in the whole spec. Make a single sheet for each, write it out daily, and quiz yourself on it weekly. These two sheets alone are worth a grade on Extended.

Cambridge mark schemes are strict about definitions. Diffusion, osmosis, active transport, transpiration, photosynthesis, respiration – memorise the textbook wording exactly. These definitions appear in nearly every biology section.

Graph questions appear on every paper, in every science. Practise plotting from raw data tables, drawing lines of best fit, and reading gradients and intercepts. Standardise your axis labels, scales, and units so it is automatic on the day.

With three sciences competing for your time, every past paper attempt has to earn its keep. Mark it honestly, write down every topic where you dropped marks across all three sciences, and revise that specific content before doing another paper.