I'm pretty sure my K-12 education (public school) and college (private university) were both above average, but I definitely learned _something_ from at least a few classes every year in K-12, and at least could tell you what sorts of things I've forgotten from them. Meanwhile, I couldn't tell you what about half of my college classes were even _supposed_ to have taught, shortly before graduation, despite passing all of them with (almost all) high marks.