Cambridge interviews are very similar to the supervisions that you have every week as a student here (see how you are taught).
If you apply to Cambridge, you send your UCAS application by the 15 October deadline (Cambridge and Oxford have an earlier deadline than for most UK universities), and most (though not all) applicants are invited for interviews, which take place in early December.
We don't suggest that you worry too much about the details of the application process when you're in Year 10, Year 11 or at this stage of Year 12, but it is useful to get a sense of what interviews are about (they are academic interviews). The important point to understand when looking at interviews, is that if you would like to study at Cambridge in the future, you may already be thinking about whether you can achieve the grades we require (see our entrance requirements), but it is equally important to enjoy your studies and explore and develop your academic interests.
When you come for interview, we will be looking for intellectual ability, aptitude for the subject, curiosity and commitment. So the interviewers (specialists in the subejct you have applied for) ask a range of questions relating to the work or reading you have done, both at school and outside it. We we will encourage you to talk about your academic interests and ideas. We encourage you to watch this film about Cambridge interviews.