My interviews were over two days. On the first day I had an hour-long aptitude test around lunchtime, and then an interview at my college (Emmanuel) in the late afternoon. There were two interviewers (the DoS and another fellow).

On the second day I had another interview at a different college (Kings) with a fellow and a PhD student.

The aptitude test was a translation of a Latin passage into English.

My first interview was initially based on a document (critical essay) that we'd been sent three weeks before to prepare, but we discussed my personal statement and other topics as well - it was rigorous and in-depth, and I was challenged on a lot of what I said and made to explain myself.

The second one (at King's) was more general (and less intense), and we discussed similar topics to the first (areas of interest in Classics, links between topics, my PS and A-Levels etc).

Probably the best preparation I did was reading all the things on my personal statement (and the general topic areas) so that I could speak confidently and in-depth about them. My submitted essay also helped in this regard. My school also organised a mock interview with a former teacher which was helpful.

Watching videos of past interviews and talking to current students who had applied the year before also helped.

Try not to overthink things afterwards (I'm guilty of this) - my interview wasn't terrible but I certainly didn't come out of it thinking I had done well/was likely to get an offer. They like to push you as much as they can to see how your mind works.