OCR A-Level Computer Science - H446 Past Papers

June 2025 H446/01 and H446/02 together assess 280 marks over 300 minutes. Programming techniques, algorithms and data structures dominate the primary topic mapping, while six extended responses contribute 60 marks. Short recall provides accessible marks; floating-point arithmetic, graph tracing, nested SQL and contextual evaluation increase demand. Difficulty and accessibility are estimates; pitfalls are inferred from the mark schemes because no examiner report is attached.

An intensive and comprehensive assessment pair that probes deep into both theoretical system fundamentals (including unnormalised floating-point calculations, network protocols, and database structures) and complex algorithmic problem-solving (featuring OOP class design, A* traversal, stack/queue array implementations, and multi-faceted essays on search optimization and global variable scoping).

The 2023 OCR A-Level Computer Science series represents a robust and programming-heavy iteration, testing core concepts through highly applied scenarios. Object-Oriented Programming (OOP) and advanced Data Structures like Trees, Stacks, and Linked Lists dominated H446/02, while H446/01 featured a tough mix of Systems Software, Web Technologies, and legal/ethical evaluations (featuring RIPA 2000). Success relied heavily on code-writing precision, formal trace methods, and structured evaluative prose.

A highly rigorous and comprehensive examination set for H446/01 and H446/02, characterized by a substantial proportion of high-tariff essay questions, complex object-oriented programming challenges, and detailed algorithmic trace exercises.