Mock interview simulators
Oxbridge maths interviews are twenty-five minutes with one problem, delivered in parts you cannot see in advance, with a tutor who probes every step and gives ground only when you ask. These simulators reproduce that. Each problem is original, escalates from accessible to genuinely hard, and comes with a mark scheme, a scored debrief and sample performances at the bottom and top of the scale, all locked until you finish.
Interviewer
Free interviews are paid for by this site and capped each day so the budget lasts. If you hit the cap, switch to self-guided or use your own key.
Whichever mode you pick, the interviewer never gives answers. It asks you to justify what you claim, gives the smallest possible nudge when you ask for one, and moves you on only when you have earned it.