OCR As Level Computer Science Paper 1 Mark Scheme

Download the official OCR AS Level Computer Science H046/01 Computing Principles mark scheme for the June 2025 examination series. This examiner-authentic OCR PDF contains complete marking guidance, model answers, pseudocode solutions, level-of-response descriptors and official OCR examiner assessment criteria for the AS Computing Principles paper.

The mark scheme provides detailed examiner-approved answers for topics including the Fetch-Decode-Execute cycle, processor registers, multicore processing, operating-system functions, Unicode versus ASCII, binary arithmetic, hexadecimal conversion, Karnaugh maps, logic gates, TCP/IP networking and transport-layer protocols. Students can study official OCR solutions for binary addition, binary subtraction, Boolean logic simplification, XOR truth tables and protocol-based networking questions.

Programming sections contain complete model solutions for 2D-array processing, counting Boolean values, calculating averages from arrays, array-versus-list comparisons and pseudocode functions. The document additionally includes OCR guidance for compiler versus interpreter questions, data-type conversion and computational-thinking assessment.

Extended-response sections provide full level-based marking descriptors and indicative content for evaluating operating-system management of a business server and ethical, legal and environmental drawbacks of autonomous drone and self-driving delivery systems. OCR also explains official marking principles such as benefit of the doubt, follow-through marking, contradictory responses, annotation symbols and structured level-of-response assessment methods used during live examination marking.

Students can use this mark scheme to understand exactly how OCR awards marks for technical accuracy, structured explanation, algorithm design, networking knowledge and systems-analysis responses. The document is ideal for self-marking, mock-exam assessment, revision planning and improving OCR exam technique for AS Computer Science.

This OCR H046/01 June 2025 mark scheme is essential for students preparing for the 2026 OCR examination series, teachers designing classroom assessments and tutors supporting OCR AS Computer Science revision. Pair it with the matching OCR H046/01 June 2025 question paper for complete examiner-guided preparation and OCR-standard assessment practice. Fully compatible with desktop, tablet and mobile PDF viewing.

This document is designed for OCR AS Level Computer Science students preparing for the 2026 examination series, especially candidates studying computing principles, networking, operating systems and logic circuits. It is particularly useful for learners aiming to improve technical accuracy, pseudocode structure, exam 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 answers and assessment criteria for classroom teaching, mock examinations, networking revision, Boolean logic practice and targeted OCR Computer Science preparation.