2x interviews (30 mins each + 30 mins pre-interview questions for 1st interview)
Measures of creativity; working with new concepts
Going through secondary school maths materials
Don't worry if English isn't your first language
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 December. I arrived in the late afternoon the day before my interview. First, a student greeted me at the
The notes I wrote during the interview prep were taken away, and I was warned that I should have written more legibly so others can later read my solutions more easily. A bit later I had a second interview with two fellows this time and no preparation. They just asked me short question until they found the topic that was my weakness and from then on they only asked me to solve problems on that topic.This interview took 30 mins as well. After that I had lunch and then went home.
In the first part, the questions were from various topics and they didn't need much initial knowledge of definitions, theorems, lemmas, etc, but measured creativity more. In the second part, the questions were shorter in the beginning, and as they found out I wasn't as quick to answer analysis questions as I was with other topics, they only asked me analysis questions. They roughly introduced me to a new concept (stability of solutions of differential equations) I didn't encounter in school before, and then I had to quickly understand it and also answer questions about that after solving differential equations.
I went through my secondary school mathematics material.
Don't worry about your English! I know this doesn't apply to everyone but I was really nervous about having to talk in English with native speakers but it was completely fine.