When my son was in K-6 he rarely completed any homeworks tasks unless they were specific research projects (this does not include accelerated subjects). When I spoke to the school about it they were never concerned as he already knew the work. Their reasoning was that homework was for students to practice and hone skills learnt that day, therefore if you could already do the work there was no point.
I then asked, well why bother giving him the sheets? and the reason was that the kids that really did need the homework wouldn't complain about the injustice of not everyone in the class receiving a sheet/s. I could see their point of view with that one!
He didn't seem to have any trouble adjusting to a full workload in HS, even if somethings were started and completed the morning they were due LOL!
