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Free · OCR H446

OCR A-Level Computer Science Revision

Notes, flashcards and real past-paper questions for every H446 topic, in the order the specification lists them. No account, no paywall.

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Year 13 exams · June 2027

Paper 1 · Computer Systems
· 2 h 30 min
--
days
Paper 2 · Algorithms and Programming
· 2 h 30 min
--
days
Full timetable
Grade calculatorEnter your marks to see your grade, or the mark you need on each paper.

The app · iPhone and iPad

The CS Wizard app

All the notes, flashcards and exam questions from this site, offline, plus 11 step-through tools and confidence tracking for all 378 terms.

Download on the App StoreWhat is in the app

£0.99 once. No subscription, no adverts, no account. Screenshots show version 2, a free update for everyone who has the app.

The app’s Home screen: today’s Daily Deck of 20 cards, an 11 day streak and a countdown in days to Paper 1 and Paper 2.
Home
The Dijkstra’s algorithm tool: a weighted graph with seven nodes, a start node A and an end node G, ready to trace.
Dijkstra's algorithm
The Progress screen: 53% confidence across the course, 161 of 378 terms mastered, 92 needing review, 40 unfamiliar and 85 not rated.
Confidence

Choose a topic

Every topic has notes, flashcards and marked past-paper questions.

Paper 1 · Computer Systems

H446/01

1.1 The characteristics of contemporary processors, input, output and storage devices

1.1.1Structure and function of the processor1.1.2Types of processor1.1.3Input, output and storage

1.2 Software and software development

1.2.1Systems software1.2.2Applications generation1.2.3Software development1.2.4Types of programming language

1.3 Exchanging data

1.3.1Compression, encryption and hashing1.3.2Databases1.3.3Networks1.3.4Web technologies

1.4 Data types, data structures and algorithms

1.4.1Data types1.4.2Data structures1.4.3Boolean algebra

1.5 Legal, moral, cultural and ethical issues

1.5.1Computing related legislation1.5.2Moral and ethical issues

Paper 2 · Algorithms and Programming

H446/02

2.1 Elements of computational thinking

2.1.1Thinking abstractly2.1.2Thinking ahead2.1.3Thinking procedurally2.1.4Thinking logically2.1.5Thinking concurrently

2.2 Problem solving and programming

2.2.1Programming techniques2.2.2Computational methods

2.3 Algorithms

2.3.1Algorithms

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Four ways in

NotesEvery spec point explained, with definitions, worked examples and exam tips.Flashcards378 cards for quick recall, by topic or in the daily deck.Exam questions302 past-paper questions with mark schemes. Mark yourself and see your weak topics.Past papersEvery paper from 2017 to 2025, each with its mark scheme.

Tools

Grade calculatorExam dates 2027Daily deckVideosSpecificationiOS app

Frequently asked questions

Is Comp Sci Wizard free?

Yes. Every note, flashcard, question and past paper is free and needs no account. The optional iOS app adds 11 step-through tools and confidence tracking for every term.

Who writes it?

An A-Level Computer Science teacher. The notes follow the H446 specification point by point and the exam tips focus on what mark schemes reward. Independent of OCR.

When are the 2027 exams?

Paper 1 is on Monday 7 June 2027 (afternoon) and Paper 2 on Tuesday 15 June 2027 (morning), from OCR's final June 2027 timetable. See the exam dates page for times and durations.