Social issues and education are not separate. That's the problem. Most of the low-performing kids are from - you might not guess it - households that are in need of social support.
Yes, there are some issues that can be demarcated as not intertwined with education.
But of course homeless people can have kids, and now they are in the foster system, and that's likely worse than fixing the homelessness. And similarly, when poor kids or their parents have medical issues, which they almost surely will have, because they don't have the resources to have a healthy lifestyle, where do you think they will go? If they have to go to work to afford medication they won't continue their studies, or simply won't even apply for higher ed.
The problem that voters should address is high costs, lack of efficiency, run of the mill corruption and so on. (But for this voters would need to accept actual cities with functioning transit system, not endless suburbs and highways around a few corporate skyscrapers. They'd need to face the actual problem of resource deficit that's needed to actually make some progress in closing the education and income gap of the disadvantaged, and so on.)