First interview: general questions and problem questions; Second interview: multiple back-to-back problems
CSAT past papers
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Do past papers; be confident
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:
Number of interviews: 2
Skype interview: No
Time between interviews: N/A
Length of first interview: 25 minutes; Length of second interview: 25 minutes
Both interviews were technical, with problems to solve, leading into discussion on the way I approached the problems.
The first interview started with some general questions about myself and continued with problem sheets. The atmosphere was relaxed and the interviewers were nice and calm.
The second one consisted in multiple problems back-to-back (as many as you can do in 30min). This was
Practiced past papers
Always say what you have in mind during the interview because the interviewers are trying to understand the way you think and approach problems rather than solving them. Do as many past papers and look for examples of interviews (though each one is different). It is very important to work hard and broaden the range of types of problems you can solve.