<p>I skipped Pre-Calculus as a freshman last year and am now currently enrolled in AP Calculus BC as a sophomore. I think Pre-Calculus is not a hard subject to learn by yourself (which you must if you want to go into AP Calculus), as the only major stuff you need to know is trigonometry. However, I have a really really good teacher for BC, and he reviews all the Pre-Calculus we need (because everyone else already forgot it over the summer), and he is the type of person who is very effective at teaching those who just have never got math before. So it varies school by school. I would suggest that if you are unsure of your capabilities to do BC, then learn the Pre-Calculus on your own, do AB, and then get ahead in the class do that you can self-study BC by the end of the school year.</p>