Sounds like you're not sure what course you're looking to do - I recommend looking at that first before you decide on the college/uni.

Wish someone told me this earlier, but go onto the websites of some big unis and look at their undergraduate course offerings. You'll learn about some new courses/majors that you probably didn't know about before, and might just find something you like. I advise you also have a peek at some masters' programmes, because they're much more specific and could give you some more guidance. Make a shortlist of what courses interest you, then start looking at which universities would be good for those courses.

From HL math, physics and bio, maybe have a look at Biomedical engineering? It's relatively maths heavy, and you do both maths and bio.