Probably a majority of the students have reached legal adulthood. Personally I think it should be made easier for those 17 and older to leave H.S.. Instead of laws meant to keep them in school (such as delaying D.L) schools should stop being a warehouse especially of those for whom H.S. is pointless.
Free education without screening for ability should end after Grade 8 - around age 14. And Middle/Junior High Schools should be abolished.
K-8 in one school, it's free. 9-12 free if you pass the entrance exam, enrollment not required for anyone, but if you pass the test and enroll, unexcused absence not allowed.