@SFNewYorker , is it possible for your son to start in the BC class and then switch to AB if needed? That’s what my D23 did last year. She very much wanted to do BC, so she did…until a month went by and though she had an A average in the course, the time she was putting into it was excessive and she could not balance everything else in her schedule in a healthy way. Once she cut back to AB, the balance was perfect. She is advanced in math…and she is advanced in other areas too and has a lot of time-consuming ECs which she cares deeply about. But she did have the opportunity to try BC with her schedule and find out. Can your son do the same? D23 still has plenty of time to take more advanced math after this year via community colleges and summer programs.