The problem was that it took so much time so i tried to shortcut by using my calculator which was ok until I got to multivariable calc which the calculator couldn't handle and I had to redo calc 1 and 2 over summer semesters. I went to class then worked 8 hrs then spent the entire rest of the evening doing the assigned homework. I had a friend comment once that he couldn't understand how I had to spend that much time on 1 class.

The upside was that after spending that much time actually learning the mechanics of derivatives and integrals, expanding that to calc 3 multivariable stuff was extremely easy. It's weird how the calculator can easily solve the 1 and 2 stuff while absolutely failing at the calc 3 stuff but at a human level the 1 and 2 stuff is extremely painful to get while converting those skills to multivariable and vector math became almost simple.