[tensor_rank_0]

take pre-calculus and do every assignment immediately as it is assigned. then review before the next class. pre-calculus is designed to give people like you the tools to move onto the maths you want to learn.

after that, echoing another top-level comment: take calculus and physics. take 2 semesters of each.

after those 3 classes, you'll know more math than 90% of the world's population. more importantly you'll be prepared to move on to differential equations, linear algebra, and vector calculus.