I think governments want our kids to attend schools so they become good little institutionalized citizens that will obey without question.
I taught my kids to read and count before they could speak, so school has been a breeze for them & what they learn there is so simple it bores them senseless. It does have some advantages though, it's gets them off the video games for 8 hours each day. I'm not that impressed by the friends they make at school but I was allowed to choose my friends & I believe everyone needs that freedom as a basic human right.
I can't see them learning much of value until high school and even then a lot of that will be BS but that's just the world we live in.