Is it possible/easy to transfer from a prelim medicine program to another categorical medicine program after your prelim year is done. Hypothetically speaking, say I was applying to an advanced program that requires a prelim year or trans year but I had a change of heart and decided that I wanted to do medicine instead but the prelim program I was at wasn't that strong and I wanted to be a categorical at a top institute. Is it possible to do that? and if so, how difficult would it be relative to the difficulty it would be to get in if I applied straight out of Med school?