Exams & revision
GCSE Science: Combined or Triple, and why it matters for tuition
By Teachers Delivered · 29 October 2026
Almost every GCSE student in England studies biology, chemistry and physics, but they do it by one of two routes. Combined Science, often called Double Science (or Trilogy, on the AQA specification), is worth two GCSEs. Triple Science, more formally the separate sciences, is worth three: one each in Biology, Chemistry and Physics.
Parents often find out which route their child is on almost by accident. The difference matters more than it first appears, both in the exam hall and in how tuition is best used.
The basic difference
| Combined Science | Triple Science | |
|---|---|---|
| GCSEs | Two | Three |
| Grade | One double grade, from 9-9 down to 1-1 | A separate 9–1 grade in each science |
| Content | The core of all three sciences | The same core, plus extra topics and more depth |
| Exams (AQA) | Six papers of 1 hour 15 minutes | Six papers of 1 hour 45 minutes |
Other boards differ in the detail, but the shape is the same. Both routes are available at Foundation and Higher tier, and both keep A-Level sciences open. Most sixth forms accept either, usually with a grade requirement such as 6-6 in Combined or a 6 in the relevant separate science, so check the one you are considering.
How Combined Science is graded
This is the part most families miss. In Combined Science, the marks from all six papers go into one pot, and a single double grade comes out: 7-7, or 7-6, or 6-6. The two numbers are always the same or next to each other.
So a student who is strong in biology and chemistry but weak in physics does not get a weak physics grade. They get a lower grade across the whole qualification, and it counts as two GCSEs. One weak science drags down both.
In Triple Science, each subject stands alone. A weak physics grade is a weak physics grade, and it does not touch biology or chemistry.
What that means for tuition
On Combined Science, target the weakest science. Because every mark lands in the same pot, the cheapest marks to gain are usually in the subject the student finds hardest, and those marks lift a grade worth two GCSEs. A tutor who specialises in that one science is often the best use of the time.
On Triple Science, decide which grade matters most. If a student wants A-Level Physics, the physics grade is the one the sixth form will look at. Tuition can be aimed at a single subject without the trade-offs of the combined pot.
On either route, watch the maths. The exam boards set a minimum share of marks for mathematical skills: at least 10% in biology, 20% in chemistry and 30% in physics, and 20% across Combined Science. Rearranging equations, converting units and reading graphs are marks that a student who "knows the science" can still lose. If maths itself is the problem, it is worth fixing at the source; our post on when maths feels impossible explains how.
And the required practicals. At least 15% of the marks come from written questions about practical work. Students who did the experiments in Year 10 and have not thought about them since are often caught out by questions on method, variables and errors.
Who decides, and when
Schools handle this differently. Some offer Triple Science as a GCSE option in Year 9, some place top sets on it, some offer it to everyone and some do not offer it at all. In some schools a student can still be moved between routes in Year 10 or Year 11, sometimes after the mocks. If your child's route is in question, our guide to using mock results is a good place to start.
Finding the right tutor
Every science tutor on Teachers Delivered is a qualified teacher with a verified Enhanced DBS check, and you can filter by the exact science and level. Browse GCSE Combined Science, GCSE Physics, GCSE Chemistry or GCSE Biology tutors, and tell them which route and exam board your child is on in your first message. A good science tutor will ask anyway.