[Retric]

Students are not equally skilled. The majority of students are not really a collage level English and History and Math and Art class starting in 11th grade, though a significant number could take a subset of those.

Simply making High School arbitrarily harder is kind of meaningless if most students would fail the material.

[gowld]

Only the best art students are ready for collage level Art classes in 11th grade.

[phamilton]

This sort of leads into competency based advancement rather than time based advancement. Rather than having a 4 year program where you rank graduates by competency (gpa), have a higher bar of competency and have people graduate at different rates.

[maxerickson]

That's part of what I'm getting at when I talk about it being an available track.

You can still have everybody lined up to finish ~17 or 18, just allow more variation in what they have finished. If someone doesn't plan to go on to college, maybe they don't need to take college prep math classes and can take classes that will serve them better.