[SC_Pete]

Primarily:
Set high standards.
Maintain discipline.
Involve the parents.

Secondarily:
Hire good teachers; fire the bad ones.

[FES0844]

Set high standards.
Maintain discipline.

Sounds like the parochial schools I went to!

[PapaBear3625]

In the final results, the biggest factors that determine the final results are :

(1) The IQ of the students;

(2) Whether their parents enforce discipline and demand performance.

(3) Intolerance of any disruptive students that interfere with the learning of others.