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A topic-by-topic AQA A-Level Computer Science (7517) revision guide to Computer Architecture — the fetch-decode-execute cycle, registers and buses, CISC vs RISC, pipelining, Boolean logic and adder circuits.

A topic-by-topic AQA A-Level Computer Science (7517) revision guide to Data Representation — number bases, signed and floating-point binary, bitwise operations, character encoding, error checking, and the consequences and legislation of computing.

A topic-by-topic AQA A-Level Computer Science (7517) revision guide to data structures — arrays and records, linked lists, stacks and queues, hash tables, trees and binary search trees, and graphs.

A topic-by-topic AQA A-Level Computer Science (7517) revision guide to databases and SQL — relational concepts, entity-relationship diagrams, normalisation, SQL queries and joins, and transactions with ACID.

A topic-by-topic AQA A-Level Computer Science (7517) revision guide to functional programming — first-class and higher-order functions, map/filter/reduce, function composition and partial application, recursion, immutability, Haskell, and big data.

A topic-by-topic AQA A-Level Computer Science (7517) revision guide to networking and communication — the TCP/IP stack, IP addressing, protocols, encryption and digital signatures, and network security.

A topic-by-topic AQA A-Level Computer Science (7517) revision guide to programming and object-oriented programming — OOP principles, inheritance and polymorphism, recursion, exception handling, and the four programming paradigms.

A topic-by-topic AQA A-Level Computer Science (7517) revision guide to Theory of Computation — finite-state machines, regular expressions, BNF, Turing machines, the halting problem and algorithm complexity.

A topic-by-topic OCR A-Level Computer Science (H446) revision guide to algorithms — searching, sorting, graph traversal, Dijkstra's algorithm, A*, recursion, Big O notation, and computational tractability.

A topic-by-topic revision guide for OCR A-Level Computer Science (H446) Boolean algebra and logic — logic gates, truth tables, Boolean laws, De Morgan's laws, expression simplification, Karnaugh maps, logic circuits, adders and flip-flops.

An OCR A-Level Computer Science (H446) revision guide to computational thinking and theory of computation — abstraction, decomposition, concurrency, finite state machines, regular expressions, BNF, Turing machines and the Chomsky hierarchy.

A topic-by-topic revision guide for OCR A-Level Computer Science (H446) data representation — number systems, binary arithmetic, two's complement and fixed point, floating point, character encoding, image and sound representation, compression, encryption and error detection.