Hardware, CPU architecture, data representation, networking, data packets, data structures, operating systems, security, storage, and user interfaces — all ten Unit 2 topics in one gamified skill path. Earn XP, collect stars, and build your exam confidence topic by topic.
Work through each topic in order. Click any unlocked node to launch the quiz. Earn three stars to master a topic and unlock the next one.
Past paper mark scheme language, distilled into ten topic cards. Click Quick Quiz on any card to test yourself instantly.
The Unit 2 paper regularly tests file size calculations, packet structure, and algorithm tracing. Use these tools to practise the skills directly.
Calculate uncompressed image and audio file sizes using the formulas from the mark scheme. Based on Jan 2021, Jun 2022, Jan 2025, and Jan 2026 questions.
Key Unit 2 terms and definitions drawn from past paper mark scheme language. Click the card to flip it, then mark whether you know it. Cards you mark as unknown cycle back around. Earn +5 XP for every card you know.
Trace through Queue processing, Stack operations, and the ARQ protocol one step at a time. Earn 10 XP for completing each trace.
Earn XP by completing quizzes and using the interactive tools. Your score updates live as you work through the topics.