OCR GCSE Computer Science (9-1) Past Papers & Mark Schemes

OCR GCSE Computer Science (J277) is one of the most popular specifications for computer science at GCSE level. It is assessed through two written examinations — there is no controlled assessment or programming project contributing to the final grade, though students must complete a programming task as part of the course. Paper 1 — Computer Systems — is a 90-minute examination accounting for half the marks, and covers the theoretical foundations: systems architecture, memory, storage, networks, security, ethical issues, and the impact of technology. Questions range from short definitions to extended responses requiring evaluation of technology choices. Paper 2, Computational Thinking, Algorithms and Programming, has the same duration and weighting. This paper tests algorithmic problem-solving, pseudocode, trace tables, searching and sorting algorithms, and Boolean logic. OCR uses its own reference language (OCR Reference Language) for code questions, so students should be comfortable reading and writing in this notation even if they programme in Python day-to-day. A distinctive feature of OCR J277 is the emphasis on logic gates and Boolean expressions. Students are expected to construct truth tables, simplify Boolean expressions, and trace through logic circuits — skills that other boards test less intensively.