NSAA; 2x interviews
Interview 1: physics, mechanics exam-style; Interview 2: maths
Past papers
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Revise your A level syllabus
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: Natural Sciences Admissions Assessment (NSAA)
Number of interviews: 2
Skype interview: no
Time between interviews: 2 hours
Length of first interview: 30 minutes; Length of second interview: 30 minutes
I had 1 Maths, 1 Physics interview. (You could pick Physics or Chemistry for second interview).
1st interview was physics, but it was basically all mechanics so very mathematical. Interviewers were friendly. Questions given on paper cards, wrote out solutions on paper. A lot like doing a mechanics exam while being watched. No questions on personal statement.
Maths interview actually felt less mathematical. Found it a little difficult
Past papers, looking through A-level spec
Don't worry about trying to prepare answers about why you want to go to Cambridge/ extracurriculars etc. as that's not the most important thing - they're just aiming to take people they think will do well academically.
Basically all I was tested on was maths, and the maths they asked only required thoughtful application of a fairly basic syllabus. I would advise you just revise the material you've already covered well, don't try to cram stuff from other syllabuses.