My breakthrough in math came when I started studying with other people. Best way to learn something is to explain it to somebody else. And you're a lot less likely to get stuck on something for half an hour if you have other people to help you. By studying with people I aced calc just by going to class and keeping up on homework.
Depends on who you are. I can't listen to other people talk about math without getting confused myself. Other people think about math differently and often throws my own thinking into a loop. I need to study alone and ask questions if truly stuck.