[citation][nom]randomizer[/nom]If people paid attention in school they wouldn't need to rely on spelling and grammar checks.[/citation]
Haven't been to school anytime recently have you? I can tell you in the US High School's (or at least California) one of the priorities is to teach you enough to pass the High School Exit Exam. Fortunately they were phasing this in when I was leaving High School but I was part of the optional class that was the beta testers for it, the teachers would spend a decent chunk of the time trying to prep us for it because people either didn't learn the stuff they should have known. Or they were just bad test takers, which does happen. So they would have to teach the subject matter for the test, than teach people how to take test just so they pass a test saying they passed because passing all your classes isn't good enough now days.
Than once that is over they have to cram all the other course material into the rest of the semester. While still taking time out to go slow enough to allow the slower students to keep pace, which is guaranteed to happen due to how there was an average of 40 students or more per teacher when I graduated. And that student/teacher ratio makes it quite difficult to teach from what I've seen. So it was usually review of what you should have already known or watered down content in hopes that everyone can keep up.
In fact most of what I learned in High School was self taught, which mainly concerned computers. I tried to take a computer class in High School, I can honestly tell you I don't think I learned a single useful thing.
It's mainly a matter of stupid requirements which are put in place which drag down education (High School Exit Exam) instead of allowing teachers to teach. Budget cuts which make classroom sizes grow, it was 40-1 when I graduated years ago before economy took a real head dive. And they couldn't always afford the equipment we needed sometimes.
So to put it short paying attention in school isn't the only problem now. It's having teachers who have the ability and are willing to teach. But the odds are stacked against them with how things are run now days.