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Most if not all of his friends from the Waldorf school went to other schools. He got into Benson Polytechnic. It's an entirely different environment, one the Waldorf school did not prepare him for.
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And support can just make them understand it? No. Doesn't work like that. You're still assuming everyone is of an equal level when it comes to intelligence, or is like you. That is most certainly not the case.
The single greatest failure of our educational system ( and likely yours) is teaching the subject and not the students as if all people learned alike. EVEN if all had equal intelligence and no issues, we all process material differently. (Seeing, reading, hearing, doing, etc) Add in the many issues that exist in our world today and the failure escalates.. Now add in an unequal level of ability... and we are failing out future.