GCSE Computer Science (OCR)

25 free revision lessons in 2 units. Open the course or go straight to a lesson.

Computer Systems

Hardware, networks, security, software and ethics

1. CPU Architecture & the Fetch-Execute Cycle
2. CPU Performance
3. Embedded Systems
4. Primary Storage (RAM, ROM & Virtual Memory)
5. Secondary Storage
6. Data Representation (Binary, Hex & Character Sets)
7. Representing Images & Sound
8. Data Compression
9. Networks, Topologies & Protocols
10. Network Security
11. Operating Systems & Utility Software
12. Ethical, Legal, Cultural & Environmental Impacts

Computational Thinking, Algorithms & Programming

Algorithms, programming, logic and testing

1. Computational Thinking
2. Designing Algorithms (Pseudocode & Flowcharts)
3. Searching Algorithms
4. Sorting Algorithms
5. Programming Fundamentals
6. Data Types & Structures
7. Advanced Programming Techniques
8. Defensive Design & Input Validation
9. Testing & Debugging
10. Boolean Logic & Truth Tables
11. Programming Languages & IDEs
12. SQL: Searching a Database
13. String Manipulation and Random Numbers

How to revise Computer Science

• Retrieval Practice
• Dual Coding
• Elaborative Interrogation
• Algorithm Tracing Practice
• Coding Practice
• Flashcard Strategies for CS
• Past Paper Approach

All subjects