the chaos of our schools, you've described it pretty well.
If your kids want to learn, they'll learn in school or out of it.
My kids went to classes like you are describing. Their grades were good enough to go to college; one even got scholarships. They made friends,
learned about all sorts of cultures... school wasn't a total waste; they had a great orchestra, that's where my sons spent most of their time.
encourage them to read. help them with stuff they aren't "getting" in school
because the chaos level is too high.
Your kids will grow up and mature and learn even in a bad school if YOU
continue to be a vital part of the process.