The only way it can be achieved is through some redistributive scheme - the wealthier must subsidize the education of the poorer. The problems are just as you outlined. But the alternative is worse.
Education doesn't have to be "equal" across all dividing lines. It just has to be good and getting better, and has to guarantee that those with real talent will advance - just as is the case with sports or beauty.
Schooling in this country has always been funded redistributively, and the Dept of Education budget of 100 billion is embllematic of that (the Dept did not exist 30 yrs ago). And I ask you, is education in this country overall better or worse, since then? I submit... worse
Standards, teaching methods , etc have degraded and all the extra funding does not alleviate or address this directly (the NEA is obstructionist, but theyre not the only problem).
But the most distressing thing of all is that the Statists (ie this article) are still pushing their agenda of more and more intervention and useless social engineering .The Nation magazine suggested once that Whites moving their kids out of poor school districts for "questionable " reasons, be prohibited from doing that. How's that for Idealism?