I think highschool should be replaced by (1) Lots of exploratory, practical courses that helps teenagers figure out what they want to do in life, (2) A coop/internship system so students get real hands-on experience and see what real workplaces are like, and (3) access to successful mentors that work in the same space that the student wants to work in.
Hmm…this sounds similar to university. Yeah just make highschool like university. That would be a good start.