I grew up during the time where we were "grouped". I believe in it totally with chances for others to advance. My daughter's school used modified grouping and it allowed them to advance.

With a class all studying the same material, the more advanced kids "help" the slower kids by giving them the answers. When they are older, many of the slower kids bully the smarter ones.

When I approached my daughter's principal about her English course - where they work on a third grade level in a 7th grade course, he said that he wants here there to pull up the slower ones. In reality, they bully her and say that she stinks, etc during class. There is no help there.

Sorry, I don't think they benefit by this and need to actually learn the material instead of just getting the answers.