That’s saying it is a zero sum game. Why is that the assumption? It seems intuitive that separating students by aptitude/achievement would make it easier to te

That’s saying it is a zero sum game. Why is that the assumption? It seems intuitive that separating students by aptitude/achievement would make it easier to teach the cohort effectively. If the range of abilities is too wide in a group of students the teacher is going to be miserable and so are all the students who don’t fall within the range the program is optimized for.