They do taylor it to your situation. For example I did worse during one of the semesters than others and they asked me to explain that. But most questions were expected. Except that I was asked what am I more interested in: Optics or Pathology. I said optics. Well, turned out that my interviewer teaches pathology 😱 But you can't win as another person who was interviewing the same day got an optics teacher and you are entitled to your own opinion, but it would be better if I said pathology 🙂 I didn't really like my interviewer, he seemed really straight-faced and did not say much until I asked a direct quesion when he had to talk 🙂 . I basically knew everything I wanted to say at some point during the interview, no matter what questions I get. And all of it was to prove that
1) I have the intellectual power to do it.
2) I know what I'm getting myself into
3) My past experiances have sufficiently prepared me for Optom school.
So in some way I led the interview a bit, like I'd get asked 1 question, I'll answer it, but then take it into a different direction that is favorable for me. Anyway, that turned out well for me, I got accepted to ICO.
Good luck!