1x test (1hr); 1x interview
Quite general questions in interview
Try various Olympiads & Maths Challenges
Don't worry if you don't know an answer immediately - interviewers will help you through
Remember this advice isn't official. There is no guarantee it will reflect your experience because university applications can change between years. Check the official Cambridge and Oxford websites for more accurate information on this year's application format and the required tests.
Also, someone else's experience may not reflect your own. Most interviews are more like conversations than tests and like, any conversation, they are quite interactive.
My interview was in early December. I was told I would be taking a pre-interview
Afterwards, I was directed to a room in another part of college for an interview with two
I'd been asked to select my two best topics prior to the interview, so the test was comprised of questions from these topics (physics and chemistry, in my case). Some of the test questions were hard, while some were (relatively) easy -- I had 10 in total but I wasn't expected to complete all of them or even the majority. One question was quite familiar but the others were new.
The interview itself wasn't as intimidating as I had expected, as the interviewers were quite friendly. I'd looked up what they
Olympiad questions - Senior Maths Challenge, Chemistry Olympiad (BChO), Physics Olympiad (BPhO). The questions are very similar in style to the questions asked at interview and in the test, in that they only rely on A-level knowledge but require you to think about and apply it in novel ways. Being good at these gets you in the right mindset to approach an interview!
Don't fluster if you don't know the answer to a question immediately! Say what you do know and explain your thought processes -- if you're missing something, the interviewers will give you hints, and what they want to see is *how* you solve and approach problems. They're not expecting people to be an encyclopaedia of extracurricular knowledge!