I can see problems with calculus, though I had none. It does require memorizing relationships and procedures. You have to work your way through, you cannot see the whole path in many complicated problems, at least I could not.
Funny, trigonometry is probably the most used math for me these days beyond arithmetic and bursts of algebra.
The best training I had in Trig and Geometry was when I went to work in a steel fabrication layout shop. Real world use of both!