Generally interviews aren’t a thing you should focus on knowledge on since they ask you to come in with no prior “vetty” knowledge, so apart from knowing the basics of the animal bits of A Level biology I would not be too focused on anatomy parts. You should focus more on reflection of work experience, motivation for being a vet, knowledge of the career and course, ethical considerations, public health, good and bad traits, current topical issues in the vet world etc - things you can discuss. If you really wanted to learn anatomy I’d learn the directional terms (caudal cranial etc) and possibly the basics of bones, e.g. ulna radius etc - but again that should not be a focus, if they present you with something “vetty” like this they are not looking for a right answer but rather to see your thought processes on working out a challenging task.
Best of luck!