Other things that we can do ourselves: (1) increase the pay for teachers; (2) standardised classroom rules like how the Koreans and Japanese do (abolish the autonomy of private schools); & (3) overhaul the curriculum.
I want to add: drop the “Senior High School” terminology; it's the source of all the confusion. We should change it to: Kinder (1); Elementary (6); Middle School (3); & High School (3) = #K12.