If you transfer to advanced science your units completed in first year medsc will get transferred, you just have to fill out a form and hand it in to the faculty of science (although it may be online now).
I was going to do Sc(Adv) purely for the flexibility. ~~~
Because the cohort tries harder.
Like, all of them want to do med after they finish, so they all try really hard and do really well, and since marks are given out depending on where you lie on the bell curve it's difficult to get up the top and get the high marks.
BUT I've never personally experienced this since I only did first year there.