I found the anatomy course to be somewhat difficult. It was medical school level gross anatomy, I don't know if people realize this, so yeah, it's going to be hard. I thought the practical exams were pretty easy though, it depends on if you have good photographic memory. Don't purchase the lab software they tell you to, all of the pics that they use for practicals are available for free on here
Human Anatomy I thought the hardest exams were 2 & 3, with head & neck being the most difficult. I think Gray's Anatomy is the best med school anatomy textbook, but I didn't really read it, it's A LOT! I just memorized all of his notes and slides and I got an A. I definitely recommend this course if you're thinking about going to med school!