I tend to believe that ordinary public education, with all of its flaws, shortcomings, and loony political agendas, generally does a pretty good job overall from K-12.
They did OK with me. I turned out literate and mathematically-literate (but I have to give my parents lots of credit for that too. My idea of a Dad was a tall guy with either a book, a chainsaw, a shovel, or a hammer in his hand. A cigarette, also.).
Well-motivated, bright, and well-disciplined kids can learn all they need there to get a good start, and if they are truly motivated and curious and in pursuit of mastery, they will take what is offered as far as they want on their own time. That's the whole point - to offer a foundation.
The challenge for school rankings (which is what school boards care a lot about) is the kids who are not in that category. They drag down the ranking, and thus property values. It's quite obvious that many if not most kids do not find academic learning to be of particular interest, even something as basic to life as algebra. Our schools aren't "failing;" our expectations are the problem.
Most kids are neither scholarly nor studious (girls are more inclined to sit than boys), and the latest stats that many or most kids learn little in college confirms that. College is whatever somebody makes of it, like everything in life.
When people talk about reforming schools, they generally are talking about trying to "meet the needs" of those who aren't very interested, talented, pushed, encouraged, or able - for whatever reasons. For them who wants it, basic eddication ain't expensive at all. For them who don't want it in youth, they can go to the internets or the library and learn all they want when they are older and more interested in things. For kids, the internets are a total time-waster and brain-killer, same as TV used to be. Well, if you have the Britannica online, maybe that might be an exception. I was raised to always review the Britannica before venturing into any new topic, for the overview and context.
So who thinks they are smart enough to change schools? Got Dough? How Billionaires Rule Our Schools.
These people don't have a clue.