If I want to be a pharmacist should I take IB Calculus or Math 251&252 in high school ?

Answer 1

Take which ever one you want. You'll be taking more math in college.

Besides we don't know what's included in Math 251 and 252.

Answer 2

In any case, take the most challenging math you feel you can. The more you learn now, the less you will have to absorb in college, where there are more demands on your time. Plus, it will help develop good study habits now. That will be one of your greatest assets in college.