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Computer Science

Complete J277 Revision Guide. Select a topic below to verify your knowledge with interactive tools.

New Release

Flash Card Hub v2.0

Master 700+ flash cards with interactive drills and full syllabus coverage. Built to help you secure a top grade.

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Quick-Start: Random Mix
New Release

ERL Editor BETA

Write, run, and trace OCR Exam Reference Language pseudocode in your browser. Step mode, variable watch & built-in examples included.

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Step Mode & Variable Watch
1

Computer Systems

1.1 Systems Architecture

CPU inputs, outputs, and storage devices.

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Diagnostic Quiz

1.2 Memory & Storage

RAM, ROM, and secondary storage types.

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Diagnostic Quiz

1.3 Networks

LAN, WAN, topologies and protocols.

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Diagnostic Quiz

1.4 Network Security

Threats, prevention, and firewalls.

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Diagnostic Quiz

1.5 Systems Software

OS functions and utility software.

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Diagnostic Quiz

1.6 Impacts of Tech

Ethical, legal, cultural and environmental.

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Diagnostic Quiz
2

Computational Thinking

2.1 Algorithms

Searching, sorting, and flowcharts.

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Diagnostic Quiz

2.2 Programming Fundamentals

Variables, loops, and data types.

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Diagnostic Quiz

2.3 Robust Programmes

Defensive design and testing.

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Diagnostic Quiz

2.4 Boolean Logic

Logic gates, truth tables, and circuit diagrams.

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Diagnostic Quiz

2.5 IDEs & Languages

Translators and development environments.

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Diagnostic Quiz
P

Practical Programming

Learn Python

Master Python programming from basics to advanced techniques. Start Coding →

Python Editor

Write, test, and debug Python code directly in your browser. Open Editor →

Bonus Resources

Cambridge Nat. IT (J836)

Access legacy resources and materials for the IT syllabus. Open IT Hub →

Speed Typing Test

Practice your keyboard speed and accuracy with this interactive test. Start Test →
3

Exam Rules & Administration

Must Know Admin & Rules

Assessment structures, calculators, ERL specifics, and the "Pseudocode Trap". View Exam Rules →