I am curiously watching this thread.
Our DS in 5th grade will take Honors Algebra 1 next year in 6th grade. He seems to be very up to the task. We know he is on a fast track and could quite possibly be the only freshman at his H.S. at this level. The outline is to have him take pre-calc, AB, BC/multivariate and then see what the school has for Senior year.

I am not sure what else to do. We will cross that bridge when we get there.

He is in a private middle school that starts with 5th grade.