Flashcards for Edexcel GCSE Computer Science The 4-layer TCP/IP model, covering the key terms, algorithms and programming syntax you need to recall for Paper 1 and Paper 2. 22 cards, matched to the Edexcel GCSE Computer Science (1CP2) specification. Recall questions account for roughly 30% of marks at GCSE Computer Science, so these target the marks you can secure before the paper starts.