<p>@mathyone, good point. FWIW, I’ve given up on the AB / BC distinction. I find it used in so many different ways in different high schools. I always thought BC included AB but my daughter’s high school has an AB/BC class that is a double period and the kids get two grades (one for AB and one for BC). Kids who have taken this crazy AB/BC class in their junior year are taking Linear Algebra or MV Calc in their senior year depending on which one is offered. (Her school also offers just AB, but not just BC, so you can’t make it into a two year sequence - crazy)</p>