A book for every reader.

Every student who likes a book on the desk.

• 19 × 24.6 cm, full colour, printed to PDF/X-4
• Notes in a main column with a side column for key terms, Exam Heat and checks
• A QR code and short code beside every section to the free practice on cswithzak.com

Standards: PDF/X-4 print master with trim and bleed boxes

Order from the books desk on WhatsApp.

Students who read on a phone, tablet or laptop.

• Highlights, notes and bookmarks that sync across up to three devices
• Mark yourself against every scheme, run every program in the labs, Ask Z about any line
• Text size, paper, sepia or night pages, serif or sans, a dyslexia-friendly mode and a colour-blind-safe mode

Get an access code from the books desk, then redeem it on My books.

Readers with dyslexia or visual stress — and anyone who finds dense pages tiring.

• A4, one column, 13 pt sans-serif text on a cream page
• 1.5× line spacing, extra letter spacing (0.04 em) and wider word spacing
• No italics anywhere — emphasis is bold
• The same content, questions and mark schemes as the standard edition

Standards: Follows the British Dyslexia Association Style Guide's typography advice

Print on request from the books desk; in the ebook, switch on Dyslexia-friendly in the reading settings.

Readers with low vision.

• A4, one column, 16 pt body text with 22 pt line spacing
• Headings from 18 to 34 pt; code in 14 pt
• Every diagram, question and scheme of the standard edition

Print on request from the books desk; the ebook goes up to 24 px text.

Readers with colour-vision deficiency — about 1 in 12 men and 1 in 200 women.

• Diagrams use the Okabe–Ito palette, designed to stay distinct for every common colour-vision deficiency
• Colour is never the only cue: every diagram role also has its own line pattern and glyph, so pages read in greyscale and on a photocopy
• Exam Heat tiers carry a letter (B C R O) as well as a colour
• The ebook's colour-blind mode adds patterns to highlights

Standards: Okabe & Ito, Color Universal Design

Built into every edition — nothing to order.

Screen-reader users and print-disabled readers.

• Tagged PDF: real headings, reading order, lists and tables a screen reader can follow
• Alt text on every figure
• Built and checked against PDF/UA-1

Standards: PDF/UA-1 (ISO 14289-1)

On request from the books desk for readers who need it.

Partners who distribute ebooks through their own platforms.

• Reflowable EPUB 3 with structural navigation and a table of contents
• schema.org accessibility metadata (access mode, features, hazards) in the package — the basis for European Accessibility Act conformance
• Validated with EPUBCheck

Standards: EPUB 3 · schema.org accessibility metadata

For publishing partners — see Publish ZAK's books.

Teachers and departments.

• A planning page after every chapter opener: lesson-by-lesson timings, the Exam Heat to weight lesson time, and how to use the Core / Stretch / Extension tiers
• Links to the free teacher tools: the Paper Builder for class tests and class results by topic, syllabus bullet and AO
• Workbook Teacher Editions carry the full mark scheme of every workbook item

For teachers — ask the books desk (we may ask which school you teach at).

Students who learn by doing — and teachers who set homework.

• A4, black and white, the same chapters as the book
• Warm-ups, graded drills, exam-style questions with real answer space, blank trace tables, fix-the-mistake and mark-it-yourself pages
• Short answers at the back; full mark schemes online behind each QR code
• Paper 2 / Paper 4 workbooks come with starter files in Python, VB.NET and Java

See inside at /books/workbooks; order from the books desk. Schools can ask for a photocopy licence.

Schools buying for a class or a department.

• Printed class sets or ebook access codes for a whole class
• A free sample booklet with a chapter from each book
• Teacher Editions and a photocopy licence for the workbooks on request

Ask the books desk.