The problem is not in principle, it is in execution.
If we spent 1/3 of what we currently spend on weapons and killing people on training our teachers and updating our educational materials and infrastructure, there would be NO bad schools. Every one of our schools would be better than the best school in the world.
The problem is not in principle, it is in execution. The GOP's answer is to cut funding and privatize education so corporations can do the bare minimum as cheaply as possible to big a profit.