How to get a grade 9-9 in GCSE Combined Science
Combined Science is worth two GCSEs, so grade 9-9 means covering biology, chemistry and physics evenly — most students lose marks in their weakest of the three, not their strongest.
Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).
What a grade 9-9 answer does
- Audit all three sciences and spend most time on your weakest topics.
- Master the required practicals across all three subjects.
- Drill the 6-mark questions and command words that appear in every paper.
- Keep calculation technique sharp for the chemistry and physics papers.
Why students miss the top grade
- Over-revising your strongest science and neglecting the weakest.
- Ignoring the maths skills that span chemistry and physics.
The method that actually works
- Practise past-paper-style questions, then mark your answer against the mark scheme — the fastest way to find the marks you drop.
- Act on the feedback: for every mark lost, write the exact phrase that would have earned it.
- Space it out and retrieve from memory rather than re-reading notes.
- Target your weakest topics, not the ones you already enjoy.
GradeNine marks your own written Combined Science answers against the mark scheme in seconds and tells you exactly which marks you missed and why — the feedback loop that moves you toward a grade 9-9. Try it free →
Grade boundaries change every year and are set by the exam board after each session — always check your board's published grade boundaries for the exact marks needed.