3x interviews, 1 general and 2 subject based (each 20-30mins).
First interview: general chat; Other two interviews: questions not difficult but one tricky.
Online research to become familiar with interview question style.
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.
I had 1 general interview, 2 subject interviews, each 20-30 minutes, then a
The general interview was just chatting with the interviewers. Questions not too hard, but there was a tricky maths question. The test was pretty hard.
Looked up every website possible, and it did help to understand the style of the questions.