I actually took AP World in high school and got a 4 on the exam, which took care of like a humanities and ethnic studies at the same time or something (definitely took care of two classes which I did not want to take in college). I'd highly recommend doing that if you can. AP Euro might take care of a humanities and ethnic studies too if you do well enough, I'm not sure, that'd be something to look in to. You'd have to look at where you want to go to college and see what AP scores count for what classes.
I did take AP Human Geo and hated the class btw.
As far as helping you for the MCAT/ Med school, neither of those are going to help you much haha. AP Biology is the class to take if you're looking to go in to medicine. That class set a new standard of difficulty for me. I'd honestly say AP Bio was harder than any bio class (and even gen chem I and II) I've taken in college so far, which includes animal bio, botany, and human physiology. I've gotten easy A's in all my science classes, which I would partially attribute to the rigor of AP bio. I didn't just learn biology, I learned how to study, because I was really being challenged.