OCR A Level Computer Science Paper 2 Mark Scheme

Download the official OCR A Level Computer Science H446/02 Algorithms and Programming mark scheme for the June 2025 examination series. This examiner-authentic OCR PDF contains complete marking guidance, pseudocode solutions, level-of-response criteria, examiner commentary and official assessment standards for OCR A Level Computer Science.

The mark scheme provides detailed answers and marking criteria for all topics assessed in the H446/02 Algorithms and Programming paper, including bubble sort, insertion sort, quick sort, recursion, divide-and-conquer algorithms, binary and linear search, stacks, linked lists, graph traversal, Dijkstra’s algorithm, A* heuristics, binary search trees, pipelining and object-oriented programming. Students can study examiner-approved pseudocode, algorithm walkthroughs and structured-model answers for both short-response and extended-evaluation questions.

The document explains OCR’s official marking principles, including “benefit of the doubt”, follow-through marking, contradictory responses, annotation symbols and level-based assessment criteria used during live examination marking. It also contains full mark-band descriptors for extended-response questions evaluating search algorithms, pipelining and linked-list implementations using object-oriented programming versus arrays.

Programming sections include complete solutions for stack push() and pop() methods, linked-list traversal and insertion methods, binary search tree traversal outputs, debugging exercises, parameter passing, variable scope and array-processing corrections. The mark scheme also provides official shortest-path solutions for Dijkstra’s algorithm, graph-based pathfinding and computational-method evaluation.

This OCR H446/02 June 2025 mark scheme is essential for self-marking, programming revision, pseudocode practice, algorithm analysis and understanding examiner expectations for high-band OCR Computer Science responses. Perfect for students preparing for the 2026 OCR examination series, teachers creating mock assessments and tutors supporting OCR A Level Computer Science revision. Pair it with the matching OCR H446/02 June 2025 question paper for complete examiner-guided preparation and assessment practice. Fully compatible with desktop, tablet and mobile PDF viewing.

This document is designed for OCR A Level Computer Science students preparing for the 2026 examination series, especially candidates studying algorithms and programming. It is particularly useful for learners aiming to improve pseudocode accuracy, algorithm evaluation, debugging technique and understanding of OCR examiner expectations.

It is also highly valuable for teachers, tutors, revision-course providers and independent learners who require official OCR marking guidance, model solutions and assessment criteria for classroom teaching, mock examinations, coding exercises and targeted OCR Computer Science revision.