Eduqas GCSE Computer Science: complete guide to the topics and the two exams

WJEC Eduqas GCSE Computer Science is the linear GCSE for England: a course assessed by two equally weighted exams sat at the end, with no coursework or non-exam assessment. Component 1 tests the theory of how computers, data, networks, software and society fit together; Component 2 is an on-screen exam where you actually write, test and refine programs at a computer. This page is the index: below is a map of the two components, the exam structure, and how to study each one.

The two Eduqas components

The specification has two components, each worth 50 percent.

Component 1: Understanding Computer Science. The theory of how a computer system is built, how data is represented and stored, how networks move and protect data, and how digital technology affects society.

• Hardware and architecture. The purpose of the CPU and the fetch-decode-execute cycle, the von Neumann architecture and registers, the factors that affect CPU performance (clock speed, cores, cache), primary and secondary storage, cloud storage, embedded systems and input/output devices.
• Data representation and storage. Binary, denary and hexadecimal conversion, binary addition and shifts, two's complement, character sets (ASCII and Unicode), units of data, and how images and sound are sampled and stored, including file-size calculations and compression (lossy and lossless).
• Networks and security. LANs and WANs, network topologies, wired versus wireless, network hardware, the internet and the common protocols (TCP/IP, HTTP, HTTPS, FTP, SMTP, POP, IMAP), the layered model, and the cybersecurity threats and the protection methods used against them.
• Algorithms and computational thinking. Computational thinking (abstraction, decomposition, algorithmic thinking), designing and tracing algorithms with pseudocode and flowcharts, the standard search and sort algorithms, logic gates and Boolean expressions, and the software development life cycle.
• Programming. The operating system and utility software, high-level versus low-level languages and translators, the building blocks of program construction (data types, operators, the three constructs, arrays and subprograms), and how Component 2 is assessed on screen.
• Impacts and legislation. The ethical, legal, cultural and environmental issues raised by digital technology, the relevant legislation (Data Protection Act, Computer Misuse Act, Copyright Designs and Patents Act), privacy and e-waste.

Component 2: Computer Programming. Designing, writing, tracing, testing and refining programs at a computer, applying computational thinking to solve set problems in a high-level language.

Exam structure

Eduqas GCSE Computer Science is assessed by two exams, both sat at the end of the course. There is no tiering: every student sits the same papers, and neither paper allows a calculator.

• Component 1: Understanding Computer Science - written examination, 1 hour 45 minutes, 80 marks, 50%. A mix of short-answer, structured and extended-response questions drawn from the whole of the theory content.
• Component 2: Computer Programming - on-screen examination, 2 hours, 80 marks, 50%. You work at a computer in your centre's chosen high-level language, writing, correcting, testing and refining programs to solve set problems.

You must also gain genuine practical programming experience across the course; it underpins Component 2 even though there is no separate coursework grade.

How to study Eduqas Computer Science

Computer Science rewards regular practical coding, fluent number work, and precise definitions.

1. Work from the specification statements. Each topic is a checklist; questions are written from it, so track your revision against the spec point by point.
2. Code and trace regularly. Component 2 is an on-screen programming exam, so practise writing and refining real code in your studied language, not only reading about it.
3. Drill the number work. Binary, denary and hexadecimal conversion, binary addition and shifts, two's complement, and image and sound file-size calculations recur in Component 1 and must be automatic.
4. Learn definitions precisely. Mark schemes reward exact wording, for example the difference between RAM and ROM, lossy versus lossless compression, or a compiler versus an interpreter.
5. Rehearse computational thinking. Decomposition, abstraction and algorithmic thinking sit behind every Component 2 task; practise breaking problems down and designing algorithms before you code.

The two components, topic by topic

Each module has specification-level answer pages with worked exam questions and cross-links. Browse the full set at /gcse-eduqas/computer-science/syllabus.

For the official specification

Eduqas publishes the full specification, sample assessment materials, past papers and mark schemes at eduqas.co.uk. Always revise from the current specification and Eduqas's own past papers, because the question style, the on-screen assessment and the permitted languages are board-specific.