There should be a close connection between school and parents.
I mean, teachers and parents of students should have the chance to arrange appointments with each other, in order to pull the cart along the same way, and all this rather often, as a work group.
Thus the good results will be more aboundant. I mean good results by referring to grades, but not only: the whole education as well.
The line of importance in a school should be: parents, teachers, students.