John Taylor Gatto — American Educator born on December 15, 1935,

John Taylor Gatto is an American author and former school teacher with nearly 30 years of experience in the classroom. He devoted much of his energy to his teaching career, then, following his resignation, authored several books on modern education, criticizing its ideology, history, and consequences. He is best known for the underground classic "Dumbing Us Down: the Hidden Curriculum of Compulsory Schooling", and The Underground History of American Education: A Schoolteacher’s Intimate Investigation Into the Problem of Modern Schooling, which is sometimes considered to be his magnum opus... (wikipedia)

Grades don't measure anything other than your relevant obedience to a manager.
In a home school, the kid does 95% of the work. But in a school system, since it's an indoctrination system, a teacher has to do 95% of the work.
For reasons that are both fair and foul - but mostly for fair reasons - we have come under the domain of a scientific-management system whose ambitions are endless. They want to manage every second of our lives, every expenditure that we make. And the schools are the training ground to create a population that's easy to manage.
School is a twelve-year jail sentence where bad habits are the only curriculum truly learned. I teach school and win awards doing it. I should know.
School reform is not enough. The notion of schooling itself must be challenged.