I don't disagree with you, in fact, I'm of the same line of thinking, but I want to explore some other explanation as to why our education system is so inadequate.

"Never attribute to malice that which is adequately explained by incompetence"

Maybe our teachers are simply unqualified to teach. I have in my circle of accquantance those who've gone into the teaching professor simply because there was nothing else available that offers the same benefits.

Most of them are ill-qualified to teach subjects such as mathematics and science. They do not have the training nor the interest in the subject matter. As such, they simply follow the curriculum blindly, assigning homework page by page, without understanding the reason for the progression.

Too little time is spent teaching and learning.

Most of the time spent in a school day, both for the student and the teacher, is rather meaningless in regards to education.

The handling of paperwork, going to and from staff meeting and grading homework takes up most of a teacher's time.

Getting to and from school, socializing, and day-dreaming takes up most of a student's time.

very little time is left for actual learning.

These are just two, I'm sure there are many more.