My approach was very simple: find the best public school system in my area and move there. "Best" is defined mostly by IQ of high-school seniors proxied by SAT scores. What colleges the school graduates go to mattered as well, but it is highly correlated with the SAT scores.

What I find important is not the school curriculum which will suck regardless. The crucial thing, IMHO, is the attitude of the students. In the school that my kids went to, the attitude was that being stupid was very uncool. Getting good grades was regarded as entirely normal and necessary for high social status (not counting the separate clusters of athletes and kids with very rich parents). The basic idea was "What, are you that dumb you can't even get an A in physics??" and not having a few AP classes was a noticeable negative. This all is still speaking about social prestige among the students and has nothing to do with teachers or parents.

I think that this attitude of "it's uncool to be stupid" is a very very important part of what makes good schools good.