I applied as an undergrad to Robinsons and I know they are all different but they started off with really easy science questions (even GCSE level), and then moved it on to A level standard, and then tried to push me until I struggled to find an answer. It is likely that they will try to test the limits of what you know.
Mine asked a lot of science questions, esp. chemistry and biology, some of which has no relation to vet science whatsoever!
They asked me about a specific case I mentioned on my work experience form and tried to test my understanding of the case.