Introduction
IB Computer Science exams are as much about exam technique as they are about content knowledge. Every year, students lose easy marks not because they don’t know the material, but because they make avoidable mistakes under pressure. Whether it’s misreading a command term, writing pseudocode incorrectly, or forgetting to link theory to a scenario, these errors can drop your grade by a level or more.
The good news? By being aware of the most common pitfalls and practicing smarter, you can avoid them — and turn your exam performance into a strength.
Quick Start Checklist
- Review command terms carefully.
- Practice writing clear pseudocode, not just code.
- Always check answers against the scenario in Paper 2.
- Manage your time — don’t get stuck on one question.
- Leave 5–10 minutes at the end to review.
The Most Common Mistakes and How to Avoid Them
1. Misreading Command Terms
- Mistake: Treating “describe” as “explain,” or “evaluate” as “list.”
- Fix: Learn the difference. For example:
- Describe = state what it is.
- Explain = give reasons.
- Evaluate = pros, cons, conclusion.
Why it matters: Marks are awarded for following the command term, not just giving information.
2. Messy Pseudocode or Code
- Mistake: Writing unclear or incomplete pseudocode.
