GCSE Computer Science
OCR J277 · Student Edition (With Answer Key)
Every topic in the J277 specification, stripped of padding and built around the Python sandbox and visualisations from the Lab. A full answer key is at the back.
The books
Two digital student editions, written section by section through the OCR specifications for my own classes.
I originally wrote them as personal annotations to master the specifications myself. They are now finished, completely free, and available to download below as PDF files.
A Level Computer Science
OCR H446 · Student Edition (No Answer Key)
The deep dive. From Two's Complement and the fetch-decode-execute cycle to the NEA, written to bridge the gap from GCSE. This edition has no answer key, so the questions are yours to work through.
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© 2026 Adriano G. Platania.
Terms and independence. These books are intended as a supplement to the textbooks officially adopted by your school: please use them alongside your prescribed course materials and follow your teacher's guidance. They are independent publications and reference the OCR GCSE (J277) and A Level (H446) specifications for navigation only. OCR is a registered trademark of Oxford Cambridge and RSA Examinations. These books are not endorsed, approved by or affiliated with OCR.