Oh, something I can help with!
I went from a 52 on my second physics test (which is thankfully being replaced by whatever we get on the final due to generous prof) to getting a 92. In my case, a lot of problems were inspired by the problems in the book. I have the following advice that applies to pretty much every math-like, quantitative heavy class - practice problem! By the time you are doing the 50th problem in the book, not only have you statistically started to enjoy the subject more, you also are now in the comfort of your home/library doing what you will be doing on the test. There really is no way around understanding the concepts and just practicing them, every single day.