The most important thing is not the teachers or the textbooks: we are educated by our environment.
Hence, the main thing to build in schools is a good social environment for children where each child feels committed to be a friend and to support the other children in a positive and helpful manner.
Then, our natural qualities—envy, cravings, pursuit of honor, and competitiveness—will only promote children because they will develop sensitivity toward society, and through it they will develop in the right direction.