Sixth Term Examination Paper (STEP), 1x interview
Solving problems on a whiteboard
Mock interview and small group practice
Practice papers
Try not to stress, and make sure you show your thought process
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: Sixth Term Examination Paper (STEP)
Number of interviews: 1
Length of interviews: About 40 minutes
Online interview: Yes
It started very fast, like "Hi! So you will need to solve some problems in front of us, writing your thoughts up on the whiteboard, please show the area around you with your camera so we see you are not cheating. Here is your first problem, solve it please" and then they were hurrying me a lot, when I was stuck they helped me. The end was also fast: "Okay so this was your last problem, you will hear from us, thank you bye"
I had a
Practice papers, which were marked by a
Don't stress (easy to say I know, but you can learn this by e.g. going to competitions in your subject), say everything you think in your interview; they are interested in how you think, not in if you know the correct answer!