Test taken: Classics Admissions Test (CAT)
Number of interviews: 3
Time between interviews: The first two (the meaty, proper ones) were a day apart. The third was because I was coming into Classics having to learn a language from scratch (basically just a question and answer about my background with language learning) and was only a few hours after the second.
Length of interviews: Half an hour for each of the proper ones, and twenty minutes for the third.
Online interview: Yes

Being Classics interviews, they touched on the main areas within the subject (literature, history, philosophy, philology/linguistics). For each of my two real interviews, I had two tutors (I think literature and philology were paired, as were history and philosophy, but it was so short and such a stressful time for other personal reasons that my memory isn't the clearest). They gave me a prompt (excerpts from a text; in the first, it was a quote from Homer and a very short, modern poem that referenced the imagery from Homer; in the second, an excerpt from a speech made in a legal case). I don't really remember what I said/the direction of questioning; sorry!

To be honest, when I found out I was shortlisted, I panicked and searched everything I could find about Classics interviews, which wasn't very detailed/helpful. I didn't do much actual, content-based preparation (I'm a very bad example, don't follow my lead here), though I reread my personal statement in case I would be asked about anything I said. Again, please don't do as I did; actually, try to prepare, follow up/revisit anything you mentioned in your personal statement, as you'll likely be asked about past reading/experiences related to Classics, and keep reading around the subject (you chose it for a reason, there's something that interests you, read or listen or watch about it; just try to consume some subject-related media).

I took the CLAT (Classics Language Aptitude Test), which is the section of the CAT for applicants who have studied neither Latin nor Greek to A-level. Because the CLAT tests aptitude for language learning (well, the learning of Greek and Latin, not all languages), rather than pre-existing knowledge, the preparation is in some ways harder (since you don't have as defined a target), but the test is probably easier (I actually had a lot of fun with it; each practice paper, even the test itself, was like a puzzle to solve). The CLAT has three parts: a section where they show you examples from a really obscure foreign language that shares some morphological (which just means "relating to the formation of words," like the added "-s" of the plural "cats" vs. just the singular "cat") characteristics with Greek and Latin and you need to guess the rules of the language to translate a few words/very short phrases (typically, you'll really just need to recognize noun declension, the changing of noun/related pronoun/relared adjective endings to reflect different genders [think of "actor" vs. "actress," or male "fiancé" and female "fiancée," except that Latin and Greek also have a third gender called neuter, which the foreign language probably also has, so be on the lookout for those three categories], numbers [at least singular and plural, possibly also a separate dual, as in a pair of xyzs or whatever], and roles in a sentence [usually there'll be a form for the person who does something, a different form for a person who gets acted upon, abd possibly more---there could be a form for "of the noun," a form for "to/for the noun" which is basically the indirect object if you've studied any modern labguages, a form "with/through/by the noun", and maybe a form for directly addressing the noun], and verb conjugation, the changing of verb endings to reflect how many people are doing the verb/the relationship between the people and the speaker [1st, 2nd, or 3rd person from English class]/the timeframe of the action [ongoing vs. completed/singular, past vs. present vs. future, possibly a perfect tense {any English verb construction using the helper verb "have", like "I have showered already"}]); another section with a made-up language, where they will again give you some examples so you can figure out the grammatical rules (pretty much same as above, but also including word order; English word order is usually subject/doer-action-object/recipient of action, so I could say "the dog bit me," but not "I bit the dog," well, at least unless I were far wilder than I actually am; when doing longer phrases/sentences, remember than adjectives and pronouns need to agree/be the same number/gender/role as nouns; you may encounter other parts of speech, but they will probably be self-explanatory/pretty similar to English); and a final section where you will need to identify/explain a subtle facet of English granmar. When I was preparing, I mainly just did a few practice papers (timed). I obviously recommend that you do that as well, since getting to know the format is very helpful. I would also recommend revising grammar (both English and any other language you may know), as knowing those concepts and the proper vocabulary will be tremendously helpful. Don't be afraid that you don't know the things they ask about in the 3rd section; you use these distinctions unconsciously, and even if you don't have the words for it, ponder their examples and you should be able to feel the difference in meaning naturally; then just play around until you can find some words to describe what it is; what helped me was thinking of each concept as a different phrase ("if this were the case," vs. "whether or not").

I actually really enjoyed the process. Pick a subject you're really interested in and don't expect yourself to be perfect; as long as you treat this as an opportunity to explore your chosen subject, I think you'll likely enjoy it too (and remember that the tutors are humans and usually very nice people; be friendly to them). My main personal regret is being too involved in university applications for US schools (I am American) and not dedicating as much time as I should have for Oxford; definitely take the opportunity to really dive into your subject, as not just preparation for some interview but for your further education going forwards.