I thought it was about either Montessori 'do not grade' or the California weird new math laws but this is simply a rant about a teacher who never learned how to

I thought it was about either Montessori 'do not grade' or the California weird new math laws but this is simply a rant about a teacher who never learned how to teach. Yes, people in the same grade don't have the same level. It's actually good: some of them will be great and have high grades, other not and will have low grade. Your job is to have both learn new stuff. You're paid for that. Good teachers will create class cohesion and will make pupils learn from each other (that's what happened in my class in highschool, we ended up very close to each other, and the whole class partied with each other ever other month or so, and we ended up all 22 in my math teacher's garden after we all got the final results (all passed).