So many things wrong here. I will lay odds that the schools are NOT based on race, but on money. In particular, the good schools will have a larger % of whites, BUT, in terms of the population, they will have a MUCH HIGHER % of INDIANS/ASIANS. Now, why is that? Because both Asians and White generally make more money and will then spend it on getting into nicer homes with decent or better schools. 

OTOH, those that are just trying to get by, will grab a place that is generally close to work. 
And in the case of illegals, they will want to hide amongst their own. A number of them actually make good money, but are sending it back home, rather than staying here.