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: BMAT
Number of interviews: 4
Skype interview: No
Interview spread: 6 hour gap betwen first two one day, then the same the next day
Length of interviews: 25 minutes each
We covered topics in my personal statement, but in far greater depth. I had to analyse graphs, and look at MRIs and scans (which I was asked to interpret). We also had a discussion about physiology.
I would recommend revising
I spoke to
The best thing I did was
I would say to relax and enjoy the interview process, try not to be preparing whilst in Oxford/Cambridge - there is