Is AP Human, Pre-AP Biology, Pre-AP Chemistry, Pre-AP English 9, and Pre-Calc doable as a freshman?

[ucbalumnus]

@billythegoldfish

I am willing to bet that if I quizzed a lot of these “accelerated” math students with simple arithmetic problems that I can do in seconds in my head (like 347 + 749), or asked them to quickly calculate a tip for my dinner bill, many of them would stumble because the foundations aren’t given enough time to develop anymore.

Calculating unweighted high school GPA seems to be a mystery to many posters on these forums.