Mandatory schooling is more about keeping people OUT of the job market than it is putting people INTO it. If schools were about training, they'd look more like universities (and if universities were about advanced training, they'd look more like business environments).

How many kids study to pass the test? How many teachers teach to get the kids to pass the test? And thereafter they forget everything. I see grown-ass adults who can't calculate a simple 20% tip on paper, and more who can't do it in their heads, and that's an EASY one. People, working in industry, who don't know that the US has 50 states. I've seen programmers with computer science degrees counting on their fingers to add numbers.

Again, you can't teach something to someone who doesn't want to learn, and you can't prevent someone from learning who does want to. Schools get the credit for education, but they're just present. The mandatory aspect did nothing.