OP I think going to the library and reaching out to books that harbor different methods of teaching.
Also, take advantage of youtube videos and relate your knowledge from the youtube videos to your lectures. This method has helped me greatly.
I'm assuming it's business calc, I'm sure if you go to your campus library there will be many books to look at to help your understanding. Many students don't utilize their resources. Keep studying hard, I've failed tests before but when I realized understanding the foundations of what I am learning and how math is derived helped me so much!!! Also the people in this thread are people you want to avoid.