My last year in HS saw only two good classes. The rest was a waste of time. If I'd know better, I'd have done the following:

My opinion would be to plan the LAST year of HS then work backwards from there. The last year should have all the hard classes, ie AP ir IB capstone classes and the focus of the schedule should be to make this work.

Then see where the skips work Stuff like language may require doing some sort of tutor or outside classwork to skip the I and II parts so the rest fits in the schedule.