2x interviews; 1x test
First interview: specific questions and personal statement; Second interview: specific questions
Reading over subjects mentioned in personal statement and A-Level notes
No!
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 a January interview/test day. The first thing was a
First interview included a problem question about DNA. Then they gave me a (not ridiculously bad) chemical mechanism to attempt. Then some questions about something I’d expressed interest in in my personal statement. In the second interview there were also some questions on DNA and genetics. They also asked me about a certain sort of bacteria.
I didn’t do much preparation. I read over the principles of chemical mechanisms because I’d mentioned them in my personal statement, and I read over my A Level notes (as I was on my gap year).
No!