OCR GCSE Computer Science Paper 1 2025 Mark Scheme

Get the official OCR GCSE Computer Science Computer Systems (J277/01) June 2025 mark scheme — the examiner-approved document used to award marks across the OCR GCSE 2025 examination series. This downloadable PDF includes accepted answers, programming-mark guidance, networking explanations, data representation solutions, cybersecurity marking criteria, ethical and environmental discussion guidance, and examiner commentary covering sound sampling, binary, hexadecimal, encryption, operating systems, mesh networks, cloud storage, DNS, IP addressing, data protection, Unicode, and CPU registers.

Use this OCR J277/01 June 2025 mark scheme to understand exactly how OCR rewards computational thinking, technical accuracy, networking knowledge, and extended written responses in GCSE Computer Science examinations. Pair it with the matching OCR J277/01 June 2025 question paper on markscheme.net for complete exam practice and timed revision sessions. Updated for the 2025/2026 academic year, fully optimised for mobile and desktop, and instantly downloadable from markscheme.net — your fastest route to top-grade GCSE Computer Science revision.

This document is designed for OCR GCSE Computer Science students preparing for the 2026 exam series, including Year 10 and Year 11 candidates, resit learners targeting Grades 7–9, home-educated students, and independent candidates studying computer systems, cybersecurity, networking, and data representation.

It is also ideal for teachers, private tutors, intervention coordinators, revision-course providers, and parents supporting GCSE Computer Science revision at home. The mark scheme can be used to teach examiner expectations, improve technical written responses, standardise marking, model high-scoring explanations, and identify common weaknesses in networking, binary arithmetic, and extended-evaluation questions.