AB versus BC is a small difference, and AB is already advanced (+1 math track).
That your high school has AB and BC as a two year sequence (instead of one year for BC including AB immediately after precalculus) indicates that the +2 math track is being overused by students who probably best belong in the +1 math track (and forcing +2 math track students to take calculus over two years slows them down to effectively +1).
Be aware that math in college during a normal semester covers material faster than you will see in high school (calculus in college is like BC including AB in one year or faster). An 8-week summer course in college will cover material faster than in a regular 15-week semester.