End government schools.
And I say this even if your local school district has the best teachers, best schools, and best education performance in the history of mankind.
The problem is that education is a highly transferable asset that always goes wherever the recipient of that education goes. I pointed this out at a business meeting a few weeks ago when I asked everyone in the room to count the number of their childhood friends still lived in the town -- or even the state -- where they graduated from high school. In reality, a lot of public school districts end up spending a fortune educating children who leave the area as soon as they can, and become productive taxpayers somewhere else.