How best can I prepare for an interview in Classics at Cambridge

First of all, critical thinking is essential when it comes to preparing for any Oxbridge - and in this case - Cambridge interview. Second of all, your ability to read widely and beyond the syllabus is what is going to greatly set you apart. Find an area of Classics that you are particularly passionate about and do not underestimate that passion you have, even if you think the area where your passion lies is not as important a topic of discussion. Remember what you wrote in your essays and be prepared to discuss it widely, as it relates to other aspects of Classics and/or even contemporary society. Remember that the interview is a mirror of what weekly supervisions/tutorials are actually like, so let your enthusiasm come through and remember you are not expected to know everything.