OCR Mark Schemes Explained — How OCR Awards Marks
How OCR mark schemes work for GCSE and A-Level. Levels of response, marking principles, command words and the assessment objectives OCR examiners use.
How OCR structures its mark schemes
OCR mark schemes are typically structured around marking principles (general guidance to examiners) followed by question-specific guidance. Short-answer questions use a points-based approach with explicit marking points; extended-response questions use level descriptors with indicative content.
OCR is particularly strict about command words and quality of written communication on extended responses — examiners will refer to a quality-of-written-communication descriptor when placing your answer in a level.
OCR assessment objectives
OCR uses standard AO weightings per subject. For sciences, you'll see AO1 (demonstrate knowledge and understanding), AO2 (apply knowledge to familiar and unfamiliar contexts), and AO3 (analyse, interpret and evaluate). The OCR specification document publishes the AO weighting per paper — read it once at the start of the year so you know which AO each part of each paper targets.
Practising with mark schemes
The fastest way to improve at any subject is to mark your own answers against the published mark scheme. Read your answer, find the marking points the scheme awards, and decide honestly whether you said enough to earn each one. Anything you missed is a focus point for the next session.
MasteryMind's AI marker automates this loop. Submit a typed or handwritten answer to a past-paper question and the AI applies the official mark scheme — telling you which marking points you hit, which you missed, and how the assessment objectives were met. The feedback is instant, so the lesson lands while the answer is still fresh.
Common OCR command words
| Command word | What examiners want |
|---|---|
| Define | Give a precise meaning — usually one or two marks for the exact wording. |
| Explain | Give a reason or chain of reasoning. "Explain why" needs a "because" answer. |
| Determine | Use given information to find a value, usually in maths or sciences. |
| Outline | Give the main features without full detail or evaluation. |
| Evaluate | Judge with reasons, weighing strengths and weaknesses to a conclusion. |
| To what extent | Argue how much you agree, with evidence on both sides. |
Frequently asked questions
Where can I find OCR past papers?
OCR publishes past papers, mark schemes and examiners' reports on ocr.org.uk under each subject's "assessment" section.
What is the QWC criterion in an OCR mark scheme?
Quality of written communication — for extended-response questions, examiners assess clarity, structure and use of subject-specific terminology when deciding which level descriptor your answer fits.
How does OCR mark practical (PAG) work?
OCR's Practical Activity Groups (PAGs) at GCSE are assessed within written papers via questions about apparatus, methods and analysis. Practical work itself is recorded but not directly graded; the underpinning knowledge is.
Mark your own OCR answers automatically
MasteryMind\'s AI marker is grounded in OCR mark schemes. Submit a typed or handwritten answer to any past-paper question and get instant, mark-scheme-accurate feedback. Try AI marking →