OCR · GCSE

Your journey to excellence inGCSE Computer Science Revision

By Revision Genie

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Prepare for the OCR GCSE Computer Science J277 exam with Revision Genie. Revise the full OCR J277 specification, practise exam-style questions for Paper 1 (Computer Systems) and Paper 2 (Algorithms & Programming), and get instant step-by-step help to boost confidence and marks.
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CPU Architecture

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CPU Performance

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Embedded Systems

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Memory & Storage

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Data Representation

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Networks

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System Security

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Systems Software

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Extended Discussion

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Hardware and Software

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Primary Storage

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Secondary Storage

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Data Units and Capacity

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Storage Devices

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Types of storage and characteristics

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RAM, ROM, and their uses

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RAM and ROM

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Number Bases

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Characters

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Images

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Sound

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Compression

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Binary Arithmetic

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Character Encoding

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Binary calculations and shifts

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Binary numbers

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Text representation (ASCII)

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Character sets

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Binary and Hexadecimal Numbers

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Binary Representation

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Units of data

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Binary and hexadecimal conversions

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Network Types

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Network Performance Factors

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Network Models

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Network Hardware

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Internet and Network Services

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Network Topologies

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Wired and Wireless Connections

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Addressing and Standards

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Network Protocols

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Protocol Layers

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Cloud storage

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Protocols and Layers

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LAN vs WAN

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Wired vs wireless connections

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Internet connectivity and IP addressing

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IP and MAC addressing

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Threats and Attacks

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Preventing Vulnerabilities

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Operating Systems

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Utility Software

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Operating system functions

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Open source and proprietary software

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Impacts of Digital Technology

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Legislation

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Software Licensing

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Environmental and ethical issues

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Computational Thinking

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Algorithm Design and Representation

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Searching Algorithms

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Sorting Algorithms

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Flowcharts

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Highest Score Calculation

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Core Programming Concepts

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Operators

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Control Flow

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Data Types

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Additional Programming Techniques

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Variables and outputs

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Arrays and loops

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Validation and loops

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Defensive Design

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Testing and Refinement

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SQL and database management

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Testing and validation

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Logic Gates

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Truth Tables

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Logic Diagrams

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Programming Language Levels

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Translators

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Integrated Development Environments

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SQL and database handling

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Characteristics and Examples

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Characteristics and Uses

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Characteristics and memory usage

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Advantages and Disadvantages

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Technological Advancements

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The purpose of the CPU and components of the CPU

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Threats and Prevention

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Technology in Society

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Technology and the environment

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Ethical and environmental issues

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WAN and cloud advantages/disadvantages

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Programming constructs

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Error types

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String manipulation

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High-level and low-level languages

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Robust and secure programming

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Subprograms and algorithms

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Testing and evaluation

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Errors

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Maintainability and functions

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Subprograms (functions and procedures)

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Testing and debugging

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Iteration

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File handling

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Input Validation and Testing

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Pseudocode

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Abstraction and decomposition

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Abstraction, decomposition, and algorithmic thinking

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CPU and Performance

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CPU and fetch-execute cycle

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Boolean logic

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Logic circuits

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SQL and validation

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SQL Statements

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Text file manipulation

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Procedures for File Storage

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Test plans

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Environmental impact of technology

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Impacts of Technology

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High-level and Low-level Programming Languages

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Program Testing

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Impact of technology decisions

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Data protection laws

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Optical vs solid-state storage

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High-level vs low-level languages

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