Elementary school is not just about learning academic stuff but about personality development as well. Unless a child is very gifted, it will also get bored ext

Elementary school is not just about learning academic stuff but about personality development as well. Unless a child is very gifted, it will also get bored extremely fast. Middle and high school is for everybody and college/University is for the smart 50% (or whatever). It's natural that you cover more in less time in college/university because students that go there are already smarter than most. If you try to apply the same standards to high school, you will push the dropout rate into 60 or more.