Oxford and Cambridge Computer Science interviews are mostly unseen problems: counting, invariants, algorithms, games, graphs and logic. No programming language is tested. Tutors want to hear how you reason, and what you do with a hint.
This guide gives you one five-step method for any unseen problem, a Part on getting stuck and taking hints, and six topic Parts: counting and recurrences, invariants and parity, algorithms and the worst case, games and winning strategies, graphs and formal systems, and logic and deduction. A further Part covers “Why Computer Science?” and your personal statement.
Each topic Part has three practice problems with full worked answers, the hint a tutor would give, and the likely follow-up. Two annotated mock interviews (one Computer Science, one Maths and Computer Science), three stretch problems and a practice plan finish the guide.
For Maths, see Oxbridge Maths Interviews. Practise out loud with the AI interviewer for Maths and Computer Science.
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