Need Moral support

I am a RN-BSN student and have been taking full time classes and working 2 days a week so I could graduate in 16 months. I am 7 weeks from graduation. This is my problem, I am taking a pathophsiology class, it is online. I know you get out what you put in, but I have been working on it at least 15-20 hours a week and am bombing theses online tests. First one was a 58 curved to a 71. This second test was a 54. Even with a curve, it can't reach a 70. I was on deans list last semester, and have an easy sociology class and a nursing class. I am happy to settle with a C, because I have already learned so much form this class. It is a requirement for graduation. I was going to call the instructortoday. Un fortunately, in the past, he has not been helpful. I read the power points, take notes and then go through the chapter and take my own notes. For the last test. There were 180 pages and I took about 20 pages of notes. I felt that I had a good grip on the material, it just wasn't what was asked on the test. I am diuscouraged, and would hate to drop this class. It is a requirement in my major so I can't take it as a pass/Fail. Please send some encouraging words. The tests are 85% of the grade. Discussion and assignments count as 15% which I ace every time.