What OCR is
OCR (Oxford Cambridge and RSA Examinations) is the UK domestic awarding body within Cambridge University Press & Assessment, the publishing-and-assessment arm of the University of Cambridge. They sit alongside Cambridge International (CAIE): same parent organisation, different markets. OCR sets and grades around 40 GCSE subjects and a similar number at A-level, all regulated by Ofqual.
Subjects OCR dominates
Computer Science
OCR holds approximately 70% of all GCSE Computer Science entries, by far the dominant provider. Their spec covers computational thinking and programming theory, data representation (binary, hex, character encodings), computer architecture (CPU, memory and secondary storage), networks and security, and practical programming assessed through written exam questions rather than coursework.
At A-level, OCR Computer Science is similarly dominant. Tutors who specialise in it know the spec's algorithm pseudocode conventions and the way OCR mark schemes credit partial correctness in code-writing questions.
Latin and Classical Greek
OCR runs the only widely-used Latin and Classical Greek GCSE and A-level specifications. Classical languages are inherently demanding: students need solid grammar and a broad vocabulary before their translation technique holds up under unseen text. The GCSE typically requires translation of unseen passages alongside detailed analysis of set Latin or Greek literature.
Ancient History and Classical Civilisation
OCR is the major provider for both. Ancient History GCSE covers Greek and Roman history with source-based analysis. Classical Civilisation covers Greek and Roman literature, art and culture without requiring the language. Both are essay-heavy and reward students who read widely beyond the textbook.
Music
OCR Music is the most-entered Music GCSE. The components are composition coursework, a performance assessment and a written listening exam. The listening paper covers a broad repertoire including set works, which change every few years.
Religious Studies (partial)
OCR has a meaningful share of GCSE Religious Studies, particularly at schools taking a more philosophy-oriented angle, since the OCR spec includes ethics and philosophy-of-religion content. AQA is still larger overall.
OCR paper format conventions
Computer Science at GCSE is two written papers with no coursework. Programming is examined through pseudocode and written code-writing questions rather than a programming project. Classical languages test unseen translation, set-text literary analysis and grammar. In Music, composition and performance coursework both feed the final grade alongside the listening exam.
Past papers and resources
Everything is on ocr.org.uk: past papers, mark schemes, examiner reports, specifications and sample assessment materials, all free. OCR also publishes annual examiner guidance documents, sometimes called "Top tips" or "Examiner's notes", which summarise common student mistakes and what high-mark answers look like. They are well worth reading for tutors and self-revising students alike.
Choosing an OCR-specialist tutor
Ask which OCR spec code they have taught most recently, for example J277 GCSE Computer Science, J282 GCSE Music or J199 GCSE Religious Studies. For Computer Science, check they cover the algorithms and programming theory thoroughly, including pseudocode conventions. For Latin or Classical Greek, ask about experience with the OCR set-text rotation and unseen-translation technique. For Music, check they know the current OCR set works and composition coursework requirements.