I have stepped into the class room, from grades 1- 12 for my kids and my grandkids also.
I am fortunate to have been taught by old nuns, that were not interested in moving into management, and they taught 35 kids day in day out every day.
Despite being a C type student, after high school testing I came out with the equivalent of 3 and 1/2 years of college. Either a miracle happened somewhere along the way between High School graduation, and the testing I underwent, the teaching was up to the teacher and it was up to the student to learn. Maybe it is the presentation??
I stand by my original remarks.