DeVos pushes for private schools. As a graduate of a private school, I can tell you, they fucking SUCK. When I got to college I quickly learned that the kids who went to the local private school (which I would've gone to had I lived closer to town) were taught about twice as much as we learned at our lousy, overpriced private school.
DeVos likes private schools because she's a religious lunatic. She wants, essentially, the Christian version of madrassas, so kids will be indoctrinated in the right-wing version of Christianity. They pushed that shit hard at my school, piping in devotionals and prayers several times a day, teaching crazy Christianized versions of science and history, using the n-word in class (no minorities could afford to go there, which was part of the school's idea). They ran the school like a camp, and it didn't get good results -- my class ended up with a lot of criminal types in it, and a lot of drunks and druggies. I was happy to get away from that place. I'm lucky I've always read a lot on my own and educated myself, because that school did a lousy job of it.
But, that's what DeVos wants. She doesn't care about education, she cares about indoctrination. And if she can't indoctrinate kids with her psychotic brand of religion, then they're of no use to her. She's a vile human being who absolutely doesn't deserve that job she bought her way into.