Triple vs Combined Science: Which Should You Take?

Triple science means taking Biology, Chemistry and Physics as three separate GCSEs or IGCSEs. Combined (or double award) science covers all three in less depth and gives two grades. AQA's GCSE Combined Science Trilogy, for example, is graded on a 17-point scale "from 1–1 to 9–9" (AQA, 2026).

Both lead to A Level sciences. This guide explains the differences on each board and how to choose.

Key Takeaways

• Triple science: three separate grades. Combined or double award: two grades.
• Triple covers more content, which helps for A Level sciences and medicine.
• Combined science still allows A Level sciences: Cambridge accepts "Co-ordinated Science".
• Choose triple if you enjoy science and may take two sciences at A Level.

What's the Difference Between Triple and Combined Science?

Triple science covers more content and gives three grades; combined science covers the same three sciences in less depth and gives two. In UK GCSEs, AQA Biology alone has two 1 hour 45 minute papers worth 100 marks each (AQA, 2026), while Combined Science Trilogy has six 1 hour 15 minute papers, two per science, worth 70 marks each (AQA, 2026).

On the Edexcel International GCSE, Double Award students sit the first paper of each separate science, at the same sessions as triple science students. In 2027, for example, Biology Paper 1B and Science Double Award Paper 1B are both on Tuesday 11 May (Pearson, 2026).

How Is Combined Science Graded?

Combined science gives a double grade. AQA Combined Science Trilogy is graded from 9–9 down to 1–1, with steps such as 6–5 in between. Foundation tier students can achieve 1–1 to 5–5, and Higher tier students 4–4 to 9–9 (AQA, 2026).

Cambridge IGCSE Co-ordinated Sciences (Double Award) works the same way, with paired grades from AA to GG (Cambridge International, 2026). Cambridge Combined Science (0653) gives a single grade.

Which Is Better for A Level Sciences?

Both can lead to A Level sciences, but triple is a smoother start. Cambridge recommends that A Level Biology students have "completed a course in Biology or Co-ordinated Science equivalent to Cambridge IGCSE" (Cambridge International, 2026), so double award science is explicitly accepted.

Many sixth forms accept combined science for A Level sciences, often asking for a higher grade such as 7–7. Check your sixth form's requirements. Our IGCSE to A Level guide explains how big the jump is.

The content gap matters most in Chemistry and Physics. Triple science students arrive at A Level having already met topics that combined science students see for the first time. If you take combined science and plan two A Level sciences, a little summer reading in those topics closes most of the gap before Year 12 starts.

Which Is Better for Medicine and Engineering?

Triple science is usually the stronger choice. Medical schools look closely at science grades, and three separate science grades give a fuller picture. Engineering and physical sciences build on Physics and Maths. See our guides to the best A Levels for medicine and the best A Levels for engineering.

That said, combined science doesn't rule these out. A strong double grade, high grades in Maths and English, and the right A Levels matter more.

How Do Results Compare?

In Cambridge IGCSE in June 2026, 39.0% of Co-ordinated Sciences (Double Award) candidates achieved A or A\*, compared with 37.3% in Biology, 44.1% in Chemistry and 44.5% in Physics (Cambridge International, 2026). The figures reflect who takes each option as much as difficulty.

Families often worry that triple science means three times the work. In practice it's more like one and a half times combined science, because so much content is shared. For students who enjoy science and are working at 6 or above, it's usually worth it.

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Frequently Asked Questions

Can you do A Level Chemistry with combined science?

Yes. Cambridge recommends prior study of "Chemistry or Co-ordinated Science equivalent to Cambridge IGCSE" (Cambridge International, 2026), and most sixth forms accept combined science, sometimes with a higher grade requirement.

Does combined science count as two GCSEs?

Yes. Combined science gives a double grade, such as 7–6, which counts as two GCSEs. AQA's Combined Science Trilogy is graded from 9–9 to 1–1 (AQA, 2026).

Is triple science harder?

There's more content, but the standard is the same. In Cambridge IGCSE, 44.1% of Chemistry candidates got A or A\* in June 2026, against 39.0% in Co-ordinated Sciences (Cambridge International, 2026), so triple science students don't do worse.

The Bottom Line

• Triple science gives three grades; combined or double award gives two.
• Both allow A Level sciences; triple makes the transition easier.
• Triple is usually better for medicine and engineering.
• Choose triple if you enjoy science and are working at grade 6 or above.

Next, read what GCSE grades you need for A Level.