Blacks and Browns

Are testing nearly six grades apart from Asian students in California. It seems like average black and brown students are 3 grades below grade level and average Asian students are nearly 3 grades above grade level. Even if you believe there might be some genetic and demographic aspect to these differences, I cannot think that could account for more than 1-2 grade levels at most. 

This is at least two trends - main one being a the total shit show of public education - bureaucrats trying to change how they teach basics like reading and math and no one in the system being held to any standards at all. And two, Asian parents not giving two fucks and insisting on their kids learning by paying for tutoring like Kumon to get it.  

My question: why not just outsource all math education to Kumon? It couldn't be worse than what the public school system is doing. Why won't they do it? Too many people making money for not doing shit.