Natural Sciences Admissions Assessment (NSAA), 2x interviews
Discussion of book mentioned on personal statement, and general physics and maths questions
Practicing difficult questions/concepts and explaining them to people
Practice problem-solving and remember the interviewers aren't there to trick you
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.
Test taken: Natural Sciences Admissions Assessment (NSAA)
Number of interviews: 2
Time between interviews: 1 hour
Length of interviews: 20 minutes
Online interview: Yes
I was asked about a book mentioned on my personal statement, and general physics and maths questions.
Lots of practice questions on Isaac physics, past Kangaroo maths challenge papers, explaining a tricky concept to different people.
Do as many questions as you can — the more problem-solving the better! The interviewers are not there to trick you and they just want to see how you think.