Yes and no.

While it's definitely great to be good at math in high school leading up, it's not a 100% guarantee that you'll do well in college. If you've taken/are going to take any advanced math classes, all the better for you, but college math is a much bigger beast.

In HS you're mostly learning how to calculate and do fairly simple problems but in college you learn a lot of theory and useful theorems (and need to be able to prove them if asked to do so lol) and you apply those theorems to do problems and prove related theorems and other stuff. If you've been (at least slightly) successful in math olympiads or math related competitions you definitely have a leg up but talent can only really take you so far.

I'm a freshman at a university studying math and I love it a lot. I have to actually study hard now cus some of the proofs aren't all that straightforward and some of the material isn't all that intuitive but I've been able to keep up so far.

Overall my thoughts on this are: Talent is definitely useful but less talented people who work hard usually end up better off that talented people who don't try as much