I am a senior doing the full IB diploma, and I take IB Math HL 2 at the moment. If you’re considering doing an IB Math course, at least do IB Math SL. Math Studies is the class that people take so they can get an “easy A”, and you’ll find that it won’t really prepare you for college-level math. SL Math will mostly cover Calculus 1, and HL Math will cover Calculus 1 and 2, so by the time you enter college you’ll be familiar with the concepts that you’ll learn.
Since you said that you’re currently taking Algebra 2 HN, I would recommend taking IB Math SL 1, as that’s the typical route IB students take. I wouldn’t recommend taking IB Math HL 1 without taking Precalculus (HN or regular) just because it’ll be a more difficult transition for you, but I have classmates who have managed to do so.
Good luck!