It is more a matter of what you want to accomplish, maths are just a tool, and I know quite a few people have trouble with what some consider as "the basics", C2 offers some system expressions to help when you do not know the exact formula to use, but it all revolves around trying to achieve a goal.
Try to see what you want to achieve, and see if you have tools that helps in C2, then if you have the knowledge to do it.
However I recommand knowing some basics about trigonometry (what sinus and cosinus are doing), some algebra (so you can manipulate formulas you could find). And for physics, you could try to see about something related to movement but I dont think it is required