Combined Science AQA 2027
Preparing for AQA GCSE Combined Science 2027? This course is all about spotting patterns across Biology, Chemistry and Physics, then using them to explain unfamiliar situations. If you combine solid subject knowledge with confident maths skills and clear reasoning, you pick up marks fast. On this page you’ll find a clear overview of what the exam covers, how the papers are split, and how to prepare in a way that actually boosts your grade.
Exam content
AQA GCSE Combined Science: Trilogy 8464 for 2027 is assessed across six written papers:
Biology Paper 1 covers Cell biology, Organisation, Infection and response, and Bioenergetics. You need to understand the structure and function of animal, plant and bacterial cells, how cells become specialised, and how substances move by diffusion, osmosis and active transport. Microscopy, the cell cycle, mitosis and stem cells are also important parts of the paper.
Organisation looks at how cells form tissues, organs and organ systems. You’ll study digestion and enzymes, the heart and circulatory system, blood vessels and blood, gas exchange in the lungs, non-communicable diseases and cancer. Plants are included too, so make sure you understand plant tissues, transpiration, translocation and how xylem and phloem transport substances.
You’ll also study communicable diseases and the body’s defences, including pathogens, vaccination, antibiotics and the development of medicines. Bioenergetics covers photosynthesis, limiting factors, aerobic and anaerobic respiration, exercise and metabolism. Practical and data-based questions are common, so practise interpreting graphs, carrying out calculations and drawing conclusions from experimental results.
Higher Tier only
- Explain how different limiting factors interact to affect the rate of photosynthesis and interpret graphs involving two or three limiting factors.
- Use the inverse square law for light intensity and consider the economics of changing greenhouse conditions to increase photosynthesis.
- Explain how lactic acid is transported to the liver and converted back into glucose, and understand oxygen debt in more detail.
Biology Paper 2 covers Homeostasis and response, Inheritance, variation and evolution, and Ecology. Homeostasis is about maintaining stable internal conditions. You’ll study the nervous system, reflexes and hormonal control, including blood glucose regulation, reproductive hormones and different methods of contraception.
Inheritance and evolution covers sexual and asexual reproduction, meiosis, DNA, genes and chromosomes. You need to understand genetic inheritance, inherited disorders, variation, natural selection and how species change over time. The topic also includes selective breeding, genetic engineering, evidence for evolution, extinction, antibiotic resistance and classification.
Ecology looks at how organisms interact with each other and their environment. You’ll study competition, interdependence, adaptations, biotic and abiotic factors, food chains and predator-prey relationships. You also need to understand sampling with quadrats and transects, the carbon and water cycles, biodiversity and the effects of human activities such as pollution, deforestation and global warming.
Higher Tier only
- Explain the role of glucagon and how insulin and glucagon interact through negative feedback to control blood glucose.
- Explain how FSH, LH, oestrogen and progesterone interact during the menstrual cycle and interpret graphs showing hormone levels.
- Understand the use of hormones to treat infertility, including fertility drugs and IVF.
- Explain the roles of adrenaline and thyroxine, including the negative feedback control of thyroxine.
- Construct genetic crosses using Punnett squares and use probability to make predictions.
- Describe the main stages of genetic engineering.
Chemistry Paper 1 covers Atomic structure and the periodic table, Bonding, structure and the properties of matter, Quantitative chemistry, Chemical changes, and Energy changes. You need to understand atoms, isotopes and electron arrangements, as well as how the periodic table developed and the properties of Groups 0, 1 and 7.
Bonding includes ionic, covalent and metallic bonding and how structure affects properties such as melting point and electrical conductivity. You’ll study simple molecules, ionic lattices, metals, polymers and giant covalent structures such as diamond and graphite, as well as graphene and fullerenes. Quantitative chemistry includes conservation of mass, relative formula mass, mass changes and concentration calculations, with moles introduced at Higher Tier.
Chemical changes covers the reactivity series, extraction of metals, reactions of acids, making salts, pH and electrolysis. Energy changes focuses on exothermic and endothermic reactions, activation energy and reaction profiles. Calculations, equations and practical methods appear throughout the paper, so make sure you can show your working clearly and use the correct units.
Higher Tier only
- Write balanced half equations and ionic equations where appropriate.
- Explain the limitations of the simple particle model.
- Understand moles and use them to calculate reacting masses, balance equations and identify limiting reactants.
- Explain oxidation and reduction in terms of electron transfer and write ionic equations for displacement reactions.
- Understand the difference between strong and weak acids in terms of ionisation and the relationship between pH and hydrogen ion concentration.
- Write half equations for reactions at electrodes during electrolysis.
- Explain energy changes using bond breaking and bond formation and calculate overall energy changes using bond energies.
Chemistry Paper 2 covers The rate and extent of chemical change, Organic chemistry, Chemical analysis, Chemistry of the atmosphere, and Using resources. You need to understand how concentration, pressure, surface area, temperature and catalysts affect reaction rates and explain these changes using collision theory. You’ll also study reversible reactions and dynamic equilibrium.
Organic chemistry focuses on crude oil and hydrocarbons. You need to understand alkanes, fractional distillation, how the properties of hydrocarbons change with molecular size, combustion and cracking. You’ll also learn about alkenes and how bromine water can be used to distinguish them from alkanes.
Chemical analysis includes pure substances, formulations, chromatography, Rf values and the tests for hydrogen, oxygen, carbon dioxide and chlorine. You’ll also study the development of Earth’s atmosphere, greenhouse gases, climate change, carbon footprints and atmospheric pollutants. Using resources covers sustainable development, potable water, wastewater treatment, life cycle assessments, recycling and reducing the use of limited resources.
Higher Tier only
- Use moles when expressing rates of reaction and use mol/s where appropriate.
- Calculate the gradient of a tangent to determine the rate of reaction at a particular time.
- Use Le Chatelier’s Principle to predict how changes in concentration, temperature and pressure affect the position of equilibrium.
- Understand and evaluate phytomining and bioleaching as alternative methods of extracting metals from low-grade ores.
Physics Paper 1 covers Energy, Electricity, Particle model of matter, and Atomic structure. Energy includes energy stores and transfers, kinetic, gravitational and elastic potential energy, specific heat capacity, power, efficiency and energy resources. Make sure you can track how energy moves through a system and explain where energy is usefully transferred or dissipated.
Electricity covers current, potential difference, resistance, circuit components, series and parallel circuits, electrical power and energy, mains electricity and the National Grid. You should be comfortable interpreting circuit diagrams and using measurements and equations to explain what happens when circuit conditions change.
The particle model includes density, changes of state, internal energy, specific heat capacity, specific latent heat and the relationship between the temperature and pressure of a gas. Atomic structure covers atoms and isotopes, the development of the atomic model, radioactive decay, alpha, beta and gamma radiation, half-life, contamination and irradiation.
For the 2027 exams, you will be given the full Physics Equations Sheet in both Physics papers, so focus on choosing the correct equation, rearranging it and using it accurately rather than memorising every equation.
Higher Tier only
- Describe ways of increasing the efficiency of an intended energy transfer.
- Use the relationship between potential difference and current in the primary and secondary coils of a transformer.
- Calculate the net decline in radioactive emission, expressed as a ratio, after a given number of half-lives.
Physics Paper 2 covers Forces, Waves, and Magnetism and electromagnetism. Forces includes scalar and vector quantities, contact and non-contact forces, gravity, resultant forces, work done, springs, speed, velocity, acceleration and Newton’s laws. You’ll also study stopping distances, reaction times and the factors affecting braking distance.
Waves covers transverse and longitudinal waves, wavelength, frequency and wave speed, as well as the electromagnetic spectrum. You need to understand the properties, uses and potential hazards of different electromagnetic waves and be able to interpret wave diagrams and experimental results.
Magnetism and electromagnetism covers permanent and induced magnets, magnetic fields and the magnetic effects of electric currents. You should understand the fields around current-carrying wires and solenoids and how electromagnets work. Generators are not part of Combined Science, and transformers are covered under Electricity on Physics Paper 1 rather than this topic.
Higher Tier only
- Resolve forces into perpendicular components and use vector diagrams to determine resultant forces.
- Explain why circular motion can involve constant speed but changing velocity.
- Use tangents on distance-time graphs and areas under velocity-time graphs.
- Understand inertia and inertial mass, and estimate forces involved in vehicle deceleration.
- Understand momentum, calculate it and apply conservation of momentum.
- Explain refraction and other interactions of electromagnetic waves in more detail, including why different waves are suitable for particular applications.
- Use Fleming’s left-hand rule, understand the motor effect, use the relationship F = BIl and explain how an electric motor works.
What to expect in the GCSE Combined Science: Trilogy 8464
AQA Combined Science: Trilogy has six papers in total, two Biology, two Chemistry and two Physics papers. Each paper is 1 hour 15 minutes, has 70 marks, and together they make up the full qualification. Foundation and Higher are different tiers, which means the style and demand of questions changes, even though the big topic areas are the same.
The most important skill, especially at Higher, is applying knowledge to unfamiliar contexts. You will often be given a new scenario, a graph, or a practical setup, then asked to explain what is happening using core ideas. A reliable technique is: state the pattern you can see, quote one piece of evidence, then explain it using a key concept. That structure keeps answers focused and makes it easy for an examiner to award marks.
Maths is a grade-maker in Combined Science, especially in Physics and quantitative Chemistry, but also in Biology where you might calculate magnification or rate. Build a short checklist habit: write the equation, substitute values with units, calculate, then check the unit and whether the answer is sensible. Many students lose marks on unit conversion or rounding, not on the actual science.
Practical skills and knowledge are assessed through the written papers, with questions relating to practical work accounting for at least 15% of the qualification. When you see an investigation, identify the independent variable, dependent variable, and at least two control variables. If asked for improvements, choose realistic ones: repeats to reduce anomalies, more precise measuring equipment, controlling temperature, or using a wider range of values. These points are predictable and score well when written clearly.
Finally, revise in “paper mode”, not just “topic mode”. Because AQA splits content by paper, you can plan revision so that your final weeks are organised around the exact paper you will sit. Use timed question sets, mark them, and write one improvement line per mistake. In the exam, keep answers concise but complete, number your points when the question asks for more than one, and avoid adding extra guesses that can contradict correct statements.
