Edexcel GCSE Computer Science (1CP2): complete guide to the six topics and the two exams

Pearson Edexcel GCSE Computer Science (specification 1CP2) is assessed by two externally examined papers sat at the end of the course. There is no coursework grade. One paper is written and one is an onscreen practical programming exam in Python. This page is the index: below is a map of the six topic areas, the exam structure, and how to study each one.

The six Edexcel Computer Science topics (1 to 6)

The specification has six numbered topics. The first five are tested in the written Paper 1; the sixth is tested in the onscreen practical Paper 2.

Topic 1: Computational thinking

Decomposition and abstraction and the benefits of subprograms, writing and following algorithms (flowcharts, pseudocode and program code) using sequence, selection, repetition and iteration, variables and data structures, the operators, trace tables, error types, the standard searching and sorting algorithms, evaluating algorithms, and truth tables with up to three inputs.

Topic 2: Data

Binary representation and the number of states a pattern can hold, unsigned and two's complement signed integers, denary to binary conversion, binary addition and shifts, overflow, hexadecimal, 7-bit ASCII, bitmap images, sampled sound, the binary storage multiples (bit, nibble, byte, kibibyte and up), file-size and capacity calculations, and lossy and lossless compression.

Topic 3: Computers

The von Neumann stored program concept and the fetch-decode-execute cycle (CPU, registers, buses, clock), secondary storage (magnetic, optical, solid state), embedded systems, operating systems, utility software, developing robust software, the difference between low-level and high-level languages, and how an interpreter differs from a compiler.

Topic 4: Networks

Why computers are networked, LANs and WANs, how the internet is structured (IP addressing, routers), how wired and wireless connectivity affect performance, transmission-rate calculations, network and email protocols, the four-layer TCP/IP model, network topologies, and network security.

Topic 5: Issues and impact

The environmental impact of digital devices, the ethical and legal issues around personal data, the ethics of artificial intelligence, machine learning and robotics, intellectual property protection, and the cybersecurity threats (malware, social engineering) and protection methods.

Topic 6: Problem solving with programming

Developing, reading, refining and debugging code; program constructs; primitive and structured data types; string handling; input, output and CSV file handling; validation and authentication; the operators; and subprograms (functions, procedures, parameters, global and local variables), all in Python 3.

Exam structure

Edexcel GCSE Computer Science is assessed by two papers, both sat at the end of the course. There is no tiering: every student sits the same papers.

• Paper 1 (Principles of Computer Science, 1CP2/01) - written, 1 hour 30 minutes, 75 marks, 50%. Five compulsory questions, one per topic (Topics 1 to 5), mixing multiple-choice, short, medium and extended responses with tabular and diagrammatic items.
• Paper 2 (Application of Computational Thinking, 1CP2/02) - onscreen practical, 2 hours, 75 marks, 50%. Six compulsory questions assessing Topic 6: you design, write, test and refine Python 3 programs in your own IDE.

How to study Edexcel Computer Science

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

1. Work from the specification points. Each numbered topic (for example 2.1 Binary) is a checklist, and the five Paper 1 questions map directly onto Topics 1 to 5.
2. Code in Python regularly. Paper 2 is a practical Python exam, so build fluency with input/output, files, validation, strings and subprograms using the Programming Language Subset.
3. Drill the number work. Binary, two's complement, hexadecimal, file-size and transmission-time calculations recur in Paper 1 and must be automatic.
4. Practise trace tables and truth tables. Both appear in Paper 1 and reward a careful, row-by-row method.
5. Learn definitions precisely. Mark schemes reward exact wording, for example the difference between RAM and ROM, lossy versus lossless compression, or a virus versus a worm.

The six topics, dot point by dot point

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

For the official specification

Pearson publishes the full specification (1CP2), the Programming Language Subset, past papers and mark schemes at qualifications.pearson.com. Always revise from the current specification and Edexcel's own past papers, because the question style, the PLS and the onscreen format are board-specific.