That is probably true. I don't know enough about the course work in US schools to comment. I expect schools would be terrible in poorer districts and private schools for the richer communities to be great quality. It's unfortunately the case everywhere in the world.I don't think you realize how terrible the American education system is, and how short we sell our youth already. They could use an increase in course work. Of course, they could also use a competent education system not managed by evangelicals. It's so bad, I remember reading an article some time ago that suggested the majority of American teachers do not understand the basics of evolution they are supposed to be teaching.
One thing I do know is that the college entrance/scholarship exams are not as hard as they ought to be. Too many students get very high scores, and it becomes more of a lottery about one or two percentage points and extracurricular factors.