The recommended progression at our local public high school is: Alg. 2/Trig; Precalc; Calc AB and then Calc BC.

Due to a phenomenal Alg. 2/Trig. class made up of kids who had all been subject accelerated, our twins hated the slow pace and repetition of PreCalc the next year (mostly seniors). Fortunately, the school let them work independently and compact Precalc and Calc AB into a single school year (they got credit for Precalc but not for Calc AB). They were in a regular class for Calc BC this past academic year and it worked out well.