Mr Kidman's ClassroomOCR · GCSE Computer Science · J277
Computer Science Revision
Understand computer systems, represent data and build reliable algorithms and programs.
Revision topics
12 topicsSystems architecture
CPU components, instruction processing, performance and embedded control.
Memory and secondary storage
RAM, ROM, cache, virtual memory and choosing persistent storage.
Data representation and compression
Binary and hexadecimal, text, images, sound, file sizes and compression.
Networks, connections and protocols
Network hardware, topologies, internet services, connections and protocols.
Network security
Threats, vulnerabilities and protections for systems, people and data.
Systems software
Operating-system services, device drivers and maintenance utilities.
Impacts of digital technology
Ethics, privacy, society, environmental impacts, legislation and licences.
Computational thinking and algorithms
Computational thinking, algorithm design, tracing, searching and sorting.
Programming fundamentals
Constructs, data types, strings, files, SQL, arrays and subprograms.
Producing robust programs
Defensive design, validation, maintainability, test data and refinement.
Boolean logic
Logic gates, expressions, circuits and complete truth tables.
Languages and development environments
Programming languages, translators and tools for editing and debugging.
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The course and practical programming
OCR J277 has two compulsory, untiered papers, each worth 80 marks and 50% of the qualification and lasting 1 hour 30 minutes. Calculators are not allowed. Paper 1 assesses computer systems; Paper 2 assesses computational thinking, algorithms and programming. CS1–CS12 are site identifiers. All specified content is included; there are no optional modules.
Build practical skills by designing, writing, testing and refining programs. Python examples use stated indexing and loop bounds; the notes distinguish OCR Exam Reference Language where conventions differ. In Paper 2 Section B code-writing tasks use that reference language or a familiar high-level language. Short quizzes cannot replace whole-program practice.
OCR Computer Science specification · Official assessment resources
Download PLCs and PLC questions
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