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A-Level Computer Science Revision

Free topic-by-topic A-Level Computer Science revision — key concepts, common mistakes and interactive games for every major topic.

Pick a topic to revise the core concepts, check the mistakes examiners look for, and practise with free games. No login required.

A-Level Computer Science topics

Data RepresentationNumber bases, two's complement, floating point, character sets and representing images and sound.Computer Systems & ArchitectureThe CPU and fetch-execute cycle, hardware and software, and operating systems.Data StructuresArrays, records, stacks, queues, linked lists, hash tables, trees and graphs.Algorithms & ComputationSearching, sorting and graph algorithms, recursion, Big-O complexity and the theory of computation.Programming & ParadigmsProgramming constructs, object-oriented and functional paradigms, and software development.Databases & SQLRelational databases, normalisation, SQL and transaction processing.Networks & the InternetNetwork topologies and protocols, TCP/IP, the internet, encryption and compression.Big Data & AIBig data, machine learning and artificial intelligence.Legal, Moral & Ethical IssuesThe legal, moral, ethical and cultural consequences of computing.

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