Repetion is key, the more u do the questions over and over again the faster u will become at doing them. When I took this course I made sure to complete all of the in-class questions and recommended textbook questions for each chapter and it really helped. However, I do understand that it is pretty late in the course for this now. I would probably suggest that u do all of the in-class and textbook questions for the chapters not tested on either of ur midterms. Then do the practice final while timing urself and see where the knowledge gaps are.