If that were the case then Asians wouldn't comprise 50% of school populations where affirmative action is banned even though there are far more middle and upper class whites in those states (California, Washington).

I don't think you've experienced what "caring about education" truly means. I mean that you are held to a high standard from a very early age. No B's allowed or you get an ass-whooping. You are expected to rank highly in any competitions or standardized testing. You're expected to take the most challenging classes possible and do well in them. Your parents constantly compare you to those better than you and motivate you to become better than them.

Those are much higher standards than what you're proposing, which is to just give them tutoring. They're things that you don't get by funding more resources, but by a certain form of family cultural norms. You can't buy culture with money.