The training actually begins in the 3rd grade with social studies and sex education.
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My 4th graders teacher was VERY displeased when we chose Ben Carson as our subject for a Black History Month subject.
The top educationists in the 17th century knew about this sweet spot and were able to train their students to be in complete command of Latin by the 8th grade. All the books in college were written in Latin. Students like Thomas Jefferson were able to enter college at an earlier date than most students do today because they had real knowledge poured into them during the sweet spot phase.
Today the only ones who truly understand the sweet spot are the leftists who employ that certain time to regiment the students into socialist thought usually without anyone knowing it. If you ever get a weird feeling about something look closely and you are probably staring into that secreted thinking masquerading as education. Parents are also unaware of this type of training, even though they are quick to notice when things are not right.
What I am referring to is known as affective education that works the emotions as opposed to true education which works with the reasoning powers of the brain.
There is at least one known culprit in all this and it is Bill Ayers. He crows about how successful he has been at creating an atmosphere for the "eventual" takeover of our children's minds leading to preparation for the ultimate marxist utopia. And I am not kidding. Right under our noses. Socialists don't like kids who know how to think because it does not fit their plan.