One third about materials science, one third about blood clotting, and one third about the immune system. One of those classes that's hard not necessarily because of the material, but because of the simply odd test questions. For better or worse, almost your entire grade is made of a few tests that each have a small number of questions, so the workload is manageable but your grade is very sensitive to each mistake.

I think this class deserves credit for an especially bizarre grading policy that was implemented after people did badly on the first exam: if you score top 5 in the class for the second midterm or final, you get an A in the class automatically. That only helps the very best people in the class do even better. If you topscore on the second exam, you have no reason to touch the last third of the material, so you end up less educated than everyone else. Also the second exam was optionally online, so you could easily cheat your way into this policy. The median grade for the final was slightly below 60%, so this policy clearly did not do much to improve things. It's fine to reward people for doing well, but to see that most of the class is struggling and address that by boosting the top 10 people even higher is funny.