Does your child need all three sciences, or will two do? Here is how each science format works, which courses need what, and how IGCSE Physics leads into A-Level Physics.
Quick answer: If your child might study Medicine, Engineering or any science at A-Level, take triple science: Biology, Chemistry and Physics as three separate IGCSEs. For other routes, a combined option is fine. At Cambridge, Combined Science (0653) is a single award worth one IGCSE, and Co-ordinated Sciences (0654) is a double award worth two IGCSEs.
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Most IGCSE students take at least one science, many take two, and a meaningful proportion take all three. But almost no guide answers the question parents actually ask: does my child need all three sciences, or will two do? And more specifically: does the answer change depending on which university programme they are targeting?
This guide answers both questions directly, based on the subject requirements universities typically publish. It also works alongside our broader IGCSE subject combination strategy guide for parents planning long-term academic pathways. It covers the science subject pool format, what each science actually tests, when triple science is necessary versus optional, and the role of Additional Maths alongside the sciences.
Plus optional: Additional Maths (0606) for STEM-focused students
The first decision in the sciences pool is not which science — it is which format. Cambridge offers three distinct science qualifications:
The decision that matters most: Separate sciences or combined science is a more consequential choice than which specific sciences to take. Separate sciences keep all A Level options open. Combined science restricts access to individual A Level science subjects at most selective schools — and therefore restricts access to competitive Medicine, Engineering, and Natural Sciences programmes at university.
Triple science covers more content across separate Biology, Chemistry and Physics qualifications, so the workload is greater, but it is not necessarily harder per topic. It is the stronger preparation for A-Level or IB sciences.
IGCSE Biology covers cell biology, genetics and inheritance, biological molecules, ecology, human physiology, and plant biology. Assessment is through Paper 1 (multiple choice), Paper 2 (structured questions), and an experimental paper or alternative. The subject rewards careful reading, precise use of biological terminology, and the ability to apply principles to unfamiliar contexts — rather than mathematical calculation.
Biology is the most directly required science for Medicine, Dentistry, Pharmacy, Biomedical Science, and Veterinary Science. Students pursuing these pathways through Cambridge IGCSE programmes are typically expected to maintain strong performance in IGCSE Biology from the earliest stages of Year 10. A student who drops Biology at IGCSE cannot take A Level Biology, which rules out almost every Medicine course. Families considering the medical pathway should also read our complete medicine subject pathway guide. See our Biology tutoring page for the full IGCSE and A Level curriculum map.
IGCSE Chemistry covers atomic structure, bonding, stoichiometry, acids and bases, organic chemistry, rates of reaction, and energy changes. It is more quantitative than Biology — calculations appear throughout — and more conceptually abstract than Physics in its early stages. Paper 6 (alternative to practical) tests experimental design and data interpretation.
Chemistry is the single most universally required science for university applications in Medicine, Dentistry, Pharmacy, Chemical Engineering, Materials Science, and Biochemistry. Students aiming at selective STEM courses often strengthen their IGCSE Chemistry well before A-Levels begin, and our A* Chemistry guide shows where marks are usually lost. If only one science beyond Biology is possible for a pre-med student, Chemistry is non-negotiable. Explore our Chemistry tutoring page for IGCSE and A Level support.
IGCSE Physics covers forces, energy, waves, electricity, magnetism, atomic and nuclear physics, and space. It is the most mathematically demanding of the three at IGCSE — equations, numerical calculations, and graph interpretation appear throughout. Students who are strong at Maths typically find Physics more intuitive than the other sciences. Building strong mathematical foundations early makes the transition into Physics significantly smoother. Students who prefer descriptive work often find it the most challenging.
Physics is usually required for Engineering and the physical sciences, and is often expected for Computer Science and some Architecture courses. Students targeting Engineering or Computer Science often find that strong preparation in IGCSE Physics and Extended Maths becomes increasingly important by Year 11. It is also strongly recommended for Medicine in some international contexts and is a virtual prerequisite for A Level Physics. Our Physics tutoring page covers the full IGCSE syllabus and common paper 4 problem areas.
| Course type | A-Levels typically required | What it means at IGCSE |
|---|---|---|
| Medicine and Dentistry | Chemistry, usually with Biology, plus one more science or Maths | Take Biology, Chemistry and Physics as separate IGCSEs (see IGCSE subjects for medicine). |
| Engineering | Maths and Physics; Further Maths helps for some courses | Separate Physics and strong Extended Maths are essential (see IGCSE subjects for engineering). |
| Natural Sciences | Two sciences plus Maths | Keep all three separate sciences until A-Level choices are made. |
| Pharmacy | Chemistry plus one of Biology, Physics or Maths | Separate Chemistry and Biology at IGCSE. |
| Computer Science | Maths, often with Further Maths or Physics | Physics and Additional Maths make A-Level Maths and Physics easier. |
| Business, Law, Humanities | No science A-Level required | One or two sciences at IGCSE is enough. |
Requirements differ between universities and change from year to year, so always confirm on each course page before Year 12 choices are made.
| Triple (separate) sciences | Co-ordinated Sciences (0654) | Combined Science (0653) | |
|---|---|---|---|
| IGCSEs earned | 3 (one each) | 2 (double award) | 1 (single award) |
| Syllabus codes (Cambridge) | 0610, 0620, 0625 | 0654 | 0653 |
| Depth | Deepest: full content in each science | Broad coverage of all three | Lightest coverage |
| Best for | Medicine, Engineering, A-Level sciences | Students keeping science options partly open | Students heading for non-science routes |
| Timetable load | Highest | Medium | Lowest |
Source: Cambridge: Combined Science vs Co-ordinated Sciences. Edexcel offers its own Science (Double Award) alongside separate Biology (4BI1), Chemistry (4CH1) and Physics (4PH1).
Students who pick separate sciences often want specialist help in the hardest one. A dedicated IGCSE Physics tutor online is the most common request we get from triple-science families.
Put plainly: if your child might consider Medicine, Dentistry, Veterinary Science, Engineering, Natural Sciences, Pharmacy, or Biomedical Research at a selective university, they should take all three sciences as separate subjects. The pathway is too demanding to leave any part of the science foundation incomplete.
If your child is clearly oriented toward Business, Law, Humanities, or Social Sciences, two sciences is a reasonable position — typically Chemistry and Biology for a flexible general foundation, or Physics and Maths for a technology-adjacent direction. Combined Science is acceptable in this context, though separate sciences remain the stronger choice if the school timetable permits.
The student who takes two separate sciences with strong grades is better positioned than the student who takes three separate sciences and spreads their preparation too thin. Depth matters. But for the STEM pathway, all three separate sciences with good preparation is the gold standard.
In practice, yes. No exam board makes IGCSE Physics a formal entry rule, but schools set their own entry grades for A-Level Physics and almost all of them expect separate IGCSE Physics, or a strong double award, plus a good grade in Maths. The A-Level course, such as Cambridge International AS & A Level Physics (9702), starts from the IGCSE ideas and moves quickly beyond them.
A student who has never met these topics has to learn them alongside the new A-Level content, which makes the first term much denser.
Take A-Level Maths alongside Physics where you can: university Physics and Engineering courses usually expect both, and the maths in A-Level Physics is much easier with it. For the grade jump itself, read how to get an A* in IGCSE and A-Level Physics, and check how hard A-Level Physics is compared with other subjects.
IGCSE Additional Maths (0606) is a distinct qualification from IGCSE Extended Maths. It covers topics — trigonometry, calculus, vectors, functions — that appear at A Level Maths from the first week. Students who take Additional Maths and perform well in it arrive at A Level Maths with a measurable advantage over those who took only Extended Maths. This is particularly relevant for students planning engineering, quantitative economics, or computer science pathways.
Additional Maths is worth considering for students targeting A Level Maths, A Level Further Maths, A Level Physics, or Computer Science — particularly students applying to universities where strong mathematical performance will differentiate them. For medicine students whose pathway does not require Further Maths, IGCSE Extended Maths is sufficient. See our Maths tutoring page for the IGCSE Extended and Additional Maths syllabus details.
For the medicine or life sciences pathway, the optimal IGCSE combination is: Maths (Extended), Biology, Chemistry, Physics, English Language, and two to three additional subjects from the humanities or languages pool. This keeps every A Level option open and provides the broadest possible university access.
For students pursuing Engineering, Computing or other quantitative routes through Pearson Edexcel or Cambridge IGCSE, subject depth becomes increasingly important by Year 11.
For the engineering or physical sciences pathway: Maths (Extended), Additional Maths, Physics, Chemistry, English Language, and two to three supporting subjects. Computer Science is a strong addition here.
For the general STEM pathway without a defined destination: Maths (Extended), Biology, Chemistry, Physics, English Language, and three subjects from the widest possible pool. Nothing closes. Everything stays open until A Level subject choices in Year 12 narrow the pathway deliberately. Students still exploring long-term STEM positioning should also see our guide to future-proof subject pathways and how STEM students build strong university profiles over time.
We offer 1-on-1 online IGCSE and A Level tutoring in Biology, Chemistry, and Physics — Cambridge and Edexcel. Whether your child needs support in one science or across all three, we build the preparation around their specific combination, timeline, and target grades.
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Related reading: IGCSE Subjects for Medicine · IGCSE Subject Combinations Guide · IB Diploma vs A Levels After IGCSE · Which IGCSE Subjects Are AI-Proof? · The IGCSE Business and Commerce Combination · How Many IGCSE Subjects to Take · IGCSE Past Papers · How to Get A* in IGCSE Maths · Cambridge IGCSE vs Edexcel
