Is anatomy and physiology hard?

I am taking it now this summer and I screwed up on one test. I made a 49 on my very first test but I am putting alot of time and effort into this class now. It was a wake up call for me to get on it. My instructor wasn't very disappointed b/c students sometimes fail the first test but do better on the next. Do you think I have a chance to pass this class if I keep making a lot of a's and b's? I really need this class and need to pass it. Some people dropped the class but I stayed in b/c I think I can pass it. Do you think I did right?