GCSE science is six exams for most students, spread across three subjects, and the revision has to be organised or it collapses into whichever topic is least frightening. This guide sets out what the exams look like, what to revise first, and a weekly rhythm built on the three methods in the revision hub: retrieval, spacing and past papers.
What is the difference between combined science and triple science at GCSE?
Combined science is one qualification worth two GCSEs; triple science is three separate GCSEs in biology, chemistry and physics. Both routes sit six exam papers, but on combined science the papers are shorter and the content narrower.
Ofqual describes combined science as “two GCSEs rolled into one qualification”, awarded as two equal or adjacent grades from 9 to 1, such as 7-7 or 6-5. On AQA’s Combined Science: Trilogy specification each of the six papers is 1 hour 15 minutes and 70 marks, 16.7% of the qualification. Pearson Edexcel’s combined science papers are 1 hour 10 minutes and 60 marks each, and OCR Gateway Combined Science A also uses 1 hour 10 minutes and 60 marks per paper. A student on AQA’s separate sciences sits two papers per subject, each 1 hour 45 minutes and 100 marks.
| Route (board) | Papers | Length of each | Marks each |
|---|---|---|---|
| Combined, AQA Trilogy | 6 | 1 h 15 min | 70 |
| Combined, Edexcel | 6 | 1 h 10 min | 60 |
| Combined, OCR Gateway A | 6 | 1 h 10 min | 60 |
| Separate sciences, AQA (per subject) | 2 | 1 h 45 min | 100 |
All of these are tiered. On AQA Trilogy a Foundation tier student can be awarded 1-1 to 5-5 and a Higher tier student 4-4 to 9-9, so the tier decision, which the school makes, sets the ceiling. Ask the school which board and tier your child is entered for before buying any revision guide; the topic lists differ between boards.
What should my child revise first in GCSE science?
Revise the paper 1 topics first, because paper 2 questions in chemistry and physics can draw on them. GCSE science students who drop paper 1 material after the first exam lose marks on both papers.
AQA states that chemistry paper 2 “may draw on fundamental concepts and principles” from the first three chemistry topics, and that physics paper 2 may draw on energy and electricity from paper 1. Atomic structure, bonding, the mole, energy stores and circuits are not “paper 1 only”; they are the language the rest of the course is written in.
Within paper 1, start with the topic your child scored lowest on in the last school test, not the one they like. Then the required practicals, below. Then the equations, which in physics and chemistry are a short, finite list that two weeks of flashcards will cover. The full topic lists for each paper are in GCSE science paper 1 vs paper 2.
What does a good weekly science revision routine look like?
A good routine touches each of the three sciences every week and uses retrieval, not re-reading. Three or four sessions of 30 to 40 minutes, each on one named topic, are a sensible starting point and fit the spacing evidence better than a single long Sunday.
Here is a suggested shape for a Year 11 in the autumn term, with one science per session:
- Monday, retrieval. Blank page, topic title at the top, write everything from memory for ten minutes. Check against the notes. Each gap becomes a flashcard.
- Wednesday, questions. Fifteen to twenty minutes of exam questions on the same topic, from a past paper or topic test. Mark with the mark scheme. Copy any missed mark-scheme point into the notes.
- Saturday, spaced return. Monday’s flashcards and one more question set on the topic, then the brain dump for the next topic.
Rotate biology, chemistry and physics so each subject gets a full cycle every three weeks. Build it in the revision timetable tool, which spaces the topics and prints a week your child can tick off. The single-subject guides for biology, chemistry and physics give the topic lists to drop in.
Do the required practicals matter in GCSE science exams?
Required practicals matter because at least 15% of the marks test practical knowledge, and the questions come from a published list. GCSE science students who can describe each practical’s method, variables and likely errors pick up marks that content revision alone misses.
Ofqual requires that no less than 15 per cent of the marks in combined science assess practical knowledge, skills and understanding, and that students complete at least sixteen practical activities; the same 15 per cent floor applies to each separate science, with at least eight practicals per subject. AQA Trilogy lists 21 required practicals across the three sciences, and Edexcel combined science has 18 mandatory core practicals.
For each practical the student should be able to write four lines from memory: the aim, the independent and dependent variables, the control variables, and one improvement. Those four lines are a flashcard. Twenty-one flashcards is a week’s work; the full AQA required practicals list gives every title.
How much maths is in GCSE science?
Maths is at least 20% of the marks in combined science and at least 30% in separate physics. GCSE science students with shaky arithmetic, rearranging or graph skills lose marks in every paper, not only the obvious calculation questions.
Ofqual’s rules require that at least 20 per cent of combined science marks credit mathematical skills, split between biology, chemistry and physics in the ratio 1:2:3. For the separate sciences the minimums are 10 per cent in biology, 20 per cent in chemistry and 30 per cent in physics. In practice that means rearranging equations, converting units, percentages and ratios, reading and drawing graphs, and standard form. If your child’s maths set has not yet covered one of these, ten minutes on that skill each week, inside the science revision, pays back in three subjects.
What are the most common GCSE science revision mistakes?
The most common mistake is revising by re-reading, and the second is revising the comfortable science three times while avoiding the hard one. GCSE science students make both because both feel productive at the time.
Other common mistakes:
- Treating the three sciences as one block. Each needs its own topic list and its own cycle.
- Doing past papers untimed, open-book and unmarked. A paper is retrieval practice only if the book is shut and the mark scheme is used.
- Leaving the required practicals and equations until “the content is done”. They are the content.
- Revising from the wrong specification. A guide for the wrong board or tier teaches topics that will not be examined.
- Highlighting. In Dunlosky’s review of study techniques, highlighting failed to help students of all sorts; use the pen to write questions instead.
If you want a qualified science teacher to run this plan with your child before the mocks, book a free call.
