I'm going to kind of agree with Youngblood on this one, in as much as it is much more important to challenge students rather than leave them understimulated and working within their comfort zone.

In my area when i was a sprog, there was really only one school, and there wasn't really any division or enough flexibility in the curriculum, and there were a lot of brighter kids there who were constantly getting in trouble, messing about in class, backchat to teachers etc etc, because the lessons were really rather basic, and not exactly a good environment.

I know it seems like an obscure topic for a presentation, but I would support the idea that the teacher would provide individual subjects that weren't the same difficulty for the bright kids and the intellectually challenged, because otherwise it's only the middle of the road kids in the class that get things at the right level.