AQA GCSE Combined Science: Trilogy (8464): complete guide to biology, chemistry, physics and the exams

AQA GCSE Combined Science: Trilogy (specification 8464) is a double award worth two GCSE grades, covering biology, chemistry and physics. It is a linear course assessed by six written papers at the end of the course, with no coursework. This page is the index: below is a map of the three sciences, the exam structure, the tiers, and how to study each one.

The three sciences

The content is split across the three sciences. Each has its own overview page linking to a focused answer page for every topic.

Biology (seven topics)

Cell biology, Organisation, Infection and response, Bioenergetics, Homeostasis and response, Inheritance variation and evolution, and Ecology. Start with the Biology topics overview.

Chemistry (nine topics)

Atomic structure and the periodic table, Bonding and structure, Quantitative chemistry, Chemical changes, Energy changes, Rate and equilibrium, Organic chemistry, Chemical analysis, and the Atmosphere and resources. Start with the Chemistry topics overview.

Physics (seven topics)

Energy, Electricity, Particle model of matter, Atomic structure, Forces, Waves, and Magnetism and electromagnetism. Start with the Physics topics overview.

Exam structure

Combined Science is assessed by six written papers, two for each science, all sat at the end of the course. Each paper is 1 hour 15 minutes, worth 70 marks, and is one sixth of the total grade.

• Biology Paper 1 - topics 1 to 4 (Cell biology, Organisation, Infection and response, Bioenergetics).
• Biology Paper 2 - topics 5 to 7 (Homeostasis and response, Inheritance variation and evolution, Ecology).
• Chemistry Paper 1 - topics 8 to 12 (Atomic structure, Bonding, Quantitative chemistry, Chemical changes, Energy changes).
• Chemistry Paper 2 - topics 13 to 17 (Rate and extent of chemical change, Organic chemistry, Chemical analysis, Atmosphere, Using resources).
• Physics Paper 1 - Energy, Electricity, Particle model of matter, Atomic structure.
• Physics Paper 2 - Forces, Waves, Magnetism and electromagnetism.

At least 20% of marks assess maths skills, and around 15% assess the required practicals and practical skills.

Foundation and Higher tiers

The qualification is tiered. You sit all six papers at one tier.

• Foundation tier targets grades 1-1 to 5-5 and covers the core content of all three sciences.
• Higher tier targets grades 4-4 to 9-9 and adds harder calculations and more demanding content.

Because Combined Science is a double award, grades are reported as two numbers (for example 6-6 or 5-4) based on the total marks across all six papers.

How to study Combined Science

Combined Science rewards precise recall, confident calculation and clear explanation.

1. Work from the specification statements. Each numbered point is a checklist; questions are written from them.
2. Learn definitions and equations. Mark schemes reward precise wording and the recall equations in physics and chemistry.
3. Drill the maths. Moles, rates, energy and electricity calculations must be automatic.
4. Master the required practicals. Standard methods and data analysis recur across all six papers.
5. Practise six-mark questions. Extended responses reward a logical, well-linked argument.

For the official specification

AQA publishes the full specification (8464), past papers and mark schemes at aqa.org.uk. Always revise from the current specification and AQA's own past papers, because question style is board-specific.