Parents who want their kids to learn and excel will get their kids to learn and excel. Be it through their own involvement with classwork or actively hunting out better education opportunities. _Money_ helps but it isn't the end-all solution.
Meanwhile, if you have parents who treat schools as day care and do jackshit to be involved in their kids education. Well, those are the failing students you get.
Shit, I'll add as a child of two eastern european immigrants. My parents both worked 2 jobs each for years while I was in public school here in the US, they immigrated with basically nothing to their name and hard labor jobs. And they would still make time to help me with homework.