OCR (Cambridge OCR) GCSE (9-1) Computer Science (J277) revision

37 free interactive Computer Science revision modules for OCR GCSE, matched to the OCR (Cambridge OCR) GCSE (9-1) Computer Science (J277) specification.

Revision modules

Algorithm Detective Designing, creating and refining algorithms ⏱️ 18 min Array Architect Additional programming techniques ⏱️ 18 min Base Camp Data storage (binary/hex, binary arithmetic, characters, images, sound — one bundled sub-topic) ⏱️ 18 min Big Debates Impacts of digital technology on wider society ⏱️ 22 min Binary Builder Data storage (binary/hex, binary arithmetic, characters, images, sound — one bundled sub-topic) ⏱️ 18 min Break the Code Testing ⏱️ 16 min Computational Thinking Computational thinking ⏱️ 18 min Control Flow Lab Core constructs and operators ⏱️ 20 min Defensive Design Defensive design ⏱️ 24 min Embedded Everywhere Embedded systems ⏱️ 16 min Inside the CPU Architecture of the CPU ⏱️ 16 min Know the Law Impacts of digital technology on wider society ⏱️ 20 min Lock It Down Prevention ⏱️ 16 min Logic Gatekeeper Boolean logic ⏱️ 22 min Lost in Translation Languages ⏱️ 20 min MOD and DIV Gym Core constructs and operators ⏱️ 20 min Network Navigator Wired/wireless, protocols and layers ⏱️ 16 min Performance Factors CPU performance ⏱️ 22 min Pixel Perfect Data storage (binary/hex, binary arithmetic, characters, images, sound — one bundled sub-topic) ⏱️ 18 min Query Quest: Select, From, Where Additional programming techniques ⏱️ 16 min RAM vs ROM Primary storage ⏱️ 12 min Search Party Searching and sorting ⏱️ 20 min Secret Codes Data storage (binary/hex, binary arithmetic, characters, images, sound — one bundled sub-topic) ⏱️ 16 min Size Matters Units ⏱️ 18 min Sort It Out: Three Ways Searching and sorting ⏱️ 20 min Sound Wave Lab Data storage (binary/hex, binary arithmetic, characters, images, sound — one bundled sub-topic) ⏱️ 18 min Squash It Compression ⏱️ 16 min Storage Showdown Secondary storage ⏱️ 22 min String Surgeon Additional programming techniques ⏱️ 16 min Subroutine Studio Additional programming techniques ⏱️ 20 min System Sorter Operating systems ⏱️ 14 min The File Handler Additional programming techniques ⏱️ 16 min The IDE Toolkit IDE tools ⏱️ 16 min The Utility Belt Utility software ⏱️ 16 min Threat Spotter Threats ⏱️ 16 min Topology Tour Networks and topologies ⏱️ 16 min Type Match Data types ⏱️ 16 min

Past papers for this specification

OCR GCSE Computer Science past papers 24 official documents · 2022-2025

Question papers, mark schemes and examiner reports, free and straight from the exam board. Revise a topic here first, then mark yourself against a real paper.

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What the specification covers

1.1 Systems architecture

1.1.1 Architecture of the CPU
1.1.2 CPU performance
1.1.3 Embedded systems

1.2 Memory and storage

1.2.1 Primary storage
1.2.2 Secondary storage
1.2.3 Units
1.2.4 Data storage (binary/hex, binary arithmetic, characters, images, sound — one bundled sub-topic)
1.2.5 Compression

1.3 Computer networks, connections and protocols

1.3.1 Networks and topologies
1.3.2 Wired/wireless, protocols and layers

1.4 Network security

1.4.1 Threats
1.4.2 Prevention

1.5 Systems software

1.5.1 Operating systems
1.5.2 Utility software

1.6 Ethical, legal, cultural and environmental impacts of digital technology

1.6.1 Impacts of digital technology on wider society

2.1 Algorithms

2.1.1 Computational thinking
2.1.2 Designing, creating and refining algorithms
2.1.3 Searching and sorting

2.2 Programming fundamentals

2.2.1 Core constructs and operators
2.2.2 Data types
2.2.3 Additional programming techniques

2.3 Producing robust programs

2.3.1 Defensive design
2.3.2 Testing

2.4 Boolean logic

2.4.1 Boolean logic

2.5 Programming languages and IDEs

2.5.1 Languages
2.5.2 IDE tools

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