Modern education was settled by corporate lobbies interests one century ago because the average citizen was determined to be no more than a specialized slave worker not an enlightened citizen ... Then it was not necessary to teach synthesis in an interdisciplinary perspective and intuition and freedom at all ... I will stop here ...
...At 14 years of age(8th grade), I've started basic calculus as part of my general education in Soviet Union.
At 21 years of age, I moved to USA and noted that 8th-graders are just learning arithmetic operations over fractions that I've learned in the 2nd grade. At 18 years of age, I thought and still think that I would never be able to bear the load Chinese students bear when I visited Shanghai -- the City of Lights. Their learning material especially on maths and physics a LOT bigger than in SU.
Those US citizens that never seen anything outside, should start thinking