In high-school I went to - Edward R Murrow, in Brooklyn, back in 90's, we had non-regents classes for really poor students (I took bio non-regents), regular cla

In high-school I went to - Edward R Murrow, in Brooklyn, back in 90's, we had non-regents classes for really poor students (I took bio non-regents), regular classes for regular students, and there were AP courses for smarter students. It was possible to take AP Calculus (smart) and non-regents Biology (not smart) and regular English (average). My daughter is in 3'rd grade. There are only 7 students in her class, and they get individually assigned different homework, based on their abilities. Back in Russia, I finished 5 grades, and we had a "smart" class, and a few regular classes for each grade. So basically I already see separation by IQ or similar in classrooms. Putting kids with different age groups will create issues. Although it could be that an eight year old is just as mathematically advanced as a ten year old, the ten year old is very likely to be a lot more advanced socially. Could probably manipulate 8 year old into whatever - I'm just talking about embarrassing them, nothing horrible. The social discrepancies are probably going to create more issues, than solving the "I'm too smart for my age group" issue.