Cambridge International A Level Computer Science Exam Technique Cheat Sheet 2026 (9618)
Every Cambridge International A Level Computer Science command word decoded — what examiners actually want, the structure that earns full marks, the top mistakes flagged in real examiner reports, and the phrases that pick up the marks others leave on the table. Free printable PDF.
5 command words decoded
5 top mistakes flagged
Phrases that earn marks
Print-ready PDF
Command words — click to expand
Top tips for Computer Science
- 1Use Cambridge pseudocode — ENDIF, ENDWHILE, NEXT are required keywords.
- 2Always indent loops, conditions and procedures.
- 3Trace tables: fill in EVERY column at EVERY iteration.
- 4For 6-mark essays: cover at least 3 distinct technical points with development.
- 5Big-O: state complexity for ALL algorithm questions (linear O(n), binary O(log n), bubble O(n²) etc.).
⚠️ Top mistakes examiners flag for Computer Science
- ✗Mixing Python syntax with Cambridge pseudocode.
- ✗Omitting ENDIF / ENDWHILE / NEXT.
- ✗Forgetting to declare variables before use.
- ✗Trace tables with missing iterations.
- ✗Confusing TCP (reliable) with UDP (faster, no guarantee).
✅ Phrases that earn marks
- → …the algorithm has O(n log n) time complexity in the average case
- → …the hash function maps keys to buckets with O(1) average lookup
- → …using public-key encryption (RSA)
- → …the operating system schedules processes using a round-robin algorithm
- → …paging reduces external fragmentation
❌ Phrases that lose marks
- ✗ The computer thinks (say: the CPU processes)
- ✗ It's faster (state Big-O complexity)
- ✗ Generic non-technical answers
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Cambridge International A Level Computer Science exam technique — FAQ
What are the most important command words in Cambridge International A Level Computer Science? ▼
Cambridge International A Level Computer Science (9618) papers use 5 core command words. The most frequently misread are Describe (algorithm) (where students add unnecessary explanation) and Explain (concept) (where students describe instead of reasoning with because/therefore). The full breakdown — what each word means, the answer structure, and the do/don't list — is in the interactive cheat sheet above.
What's the difference between "describe" and "explain" in Cambridge International A Level Computer Science? ▼
Describe asks WHAT happens — quote values from data, state the trend, no reasoning. Explain asks WHY — every sentence must contain "because", "therefore" or "as a result". Mixing them up is one of the highest-frequency reasons Cambridge International A Level Computer Science students lose marks they could have earned with the same content.
What are the top examiner-flagged mistakes for Cambridge International A Level Computer Science? ▼
Across recent Cambridge International A Level Computer Science examiner reports, the most-flagged mistakes are: Mixing Python syntax with Cambridge pseudocode.; Omitting ENDIF / ENDWHILE / NEXT.; Forgetting to declare variables before use.. The full list with explanations is in the "Top mistakes" block in the cheat sheet above.
Can I print the Cambridge International A Level Computer Science exam technique cheat sheet as a PDF? ▼
Yes — click the "Download Computer Science Cheat Sheet PDF" button above. Sign up free (no payment), and the printable A4 PDF downloads instantly. The PDF includes the command-word table, top tips, common mistakes and the earn/avoid phrase pairs — designed to fit on one page so you can pin it above your desk.
Will this cheat sheet help me get top marks in Cambridge International A Level Computer Science? ▼
The cheat sheet covers EXAM TECHNIQUE — how to read command words, structure answers, and use mark-scheme language. Combined with strong subject knowledge it can lift students by 1–2 grades by closing the gap on extended-response questions.
Is this Cambridge International A Level Computer Science cheat sheet free? ▼
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