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It's not that simple. Alot of highschool aged kids need to work to save for college or just to feed their families.

Starting school later sound good if you live a very privileged life, but makes life impossible if you need to leave a 3 to work.

Make the last class optional to attend. It’s not like people learn anything of worth in classes.

If a high school class was optional to attend, that class would not be attended. Your solution instantly becomes "cancel the last class of the day."