AP Calculus and AP Physics were the most dreaded classes in high school and students were discouraged to take them. I did take AP Calculus (for obvious reasons I was already familiar with functions that take other functions as parameters and return yet other functions) but I followed conventional wisdom and held-off on AP Physics.
Oddly, however, when I got to college I got better grades in _more difficult_ calculus classes (multivariate, vector calculus, differential equations) in college and did well in Physics (which was meant to serve as a "weed-out" class, i.e., forced-curved such that at least 25-50% would fail). I think the psychology had much to do with this: this is a freshman class full of people, why _shouldn't_ I master this material?
I wonder what would happen if instead high school students were told "these are the very basics of modern physics and mathematics and every technical major or minor -- at colleges that are far less selective than where many of you are headed -- is expected to pass them."
[1] When I came to the US in seventh grade from former USSR (where I was already studying algebra, geometry, physics and chemistry at the time) I had a math "placement test" tossed me the first day without any warning and scored two points below the threshold to place me into a "pre-Algebra class" that would merely qualify me for the privilege of studying algebra in 8th grade! I had to take a course at a local community college and pass two additional placement tests over the summer vacation to place into 8th grade algebra. It's no wonder that students assume they're "bad at math" given such an environment.