<p>Every kid I know of has struggled to some extent with college calculus, post AP-Calc. My son is VERY strong in math, 5 on the AP Calc BC exam, and went straight into Calc 3 and had a very hard time. </p>
<p>Son 3 may do just as well on the AP exam. He'll take no higher than Calc 2 in college.</p>
<p>Be careful of depending on AP Calc to actually replace the content of the lower calculus classes. I have a feeling it depends on the school and the professor. Err on the side of caution.</p>