OCR A-level Computer Science (H446)
Every topic with its OCR specification reference, free notes and tools to revise it, and your summer 2027 papers.
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| Topic | Spec | Notes and tools | How sure |
|---|---|---|---|
| Programming techniques | 2.2.1 | ||
| Object-oriented programming | 1.2.4 (object-oriented languages) | Object-oriented programming | |
| Data structures | 1.4.2 and 2.3.1 | Stacks, queues and reverse Polish notation | |
| Algorithms | 2.1, 2.2.2, 2.3.1 | Sorting algorithms: bubble, insertion, merge and quick sort | |
| Theory of computation | 2.1 (computational thinking), 2.3.1 (Big-O), 1.4.3 (BNF and sets where taught) |
9 topics
| Topic | Spec | Notes and tools | How sure |
|---|---|---|---|
| Number representation | 1.4.1 (data types: floating point, bitwise manipulation, sign and magnitude), 1.3.1 (compression and encryption) | Floating point representation | |
| Boolean algebra and logic circuits | 1.4.3 | Boolean algebra and De Morgan's laws | |
| Systems software and software development | 1.2.1 to 1.2.3 | ||
| Processors and assembly language | 1.1.1 to 1.1.3, 1.2.1 (c) interrupts, 1.2.4 (c) and (d) assembly and addressing modes | ||
| Consequences of computing and Big Data | 1.5 | ||
| Communication and networking | 1.3.1 (c) and (d), 1.3.3, 1.3.4 | ||
| Databases and SQL | 1.3.2 (including flat files, secondary keys, indexing and data exchange) | ||
| Functional programming | 1.2.4 (programming paradigms) | ||
| The programming project (NEA) | Component 03/04 (programming project) |
Your summer 2027 exams
| Paper | Date | Starts | Length |
|---|---|---|---|
| Computer systems H446/01 | Monday 7 June 2027 | 13:30 | 2h 30m |
| Algorithms and programming H446/02 | Tuesday 15 June 2027 | 9:00 | 2h 30m |
Foundation and Higher papers are sat at the same time, so one row covers both. Source: OCR AS and A Level final examination timetable, June 2027 (final timetable), read on Wed 7 Oct. PDF (opens a new tab)
Official OCR pages
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Search for H446 on the board's page to find this course.
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