About CS Code

CS Code is a free revision site for OCR A level Computer Science (H446), made because students asked for one. It is a sister site of Maths Code.

What is here

• Knowledge organisers: one or two A4 pages for each topic.
• Worksheets: questions on one topic that climb from the basics to exam style, with answers and a mark scheme.
• Practice papers: full papers in the layout of the H446 papers for Component 01 and Component 02, with mark schemes.

How the questions are made

Calculated questions (binary, trace tables, sorting, SQL results and many more) are worked out by the site from a set of numbers, and the answer is worked out from the same numbers, so the answer always matches the question. Every kind of question is also solved a second, separate way by our checks, and both must agree before it goes on the site.

Written questions ("describe", "explain", "discuss") come from a bank of questions with mark points, written once for each topic and checked by a computer science teacher.

Codes

Every worksheet and paper has a code, such as CS-BOO-4321 or H446-01-4321. The same code always gives the same questions, so you can share a code with a friend, or open it again later. "New questions" gives a new code.

Beta

CS Code is in open beta: free, and still being built. Topics are added one at a time, Year 13 first. If you find a mistake or have an idea, use Send feedback at the bottom of any page.