Stacie, that seems very odd that with this kind of program (i.e. heterogeneous grouping) there are not projects and other tiered level assignments for the kids. This was required at my last school. It is EASY to have the kids read, test, read and do no writing or thinking! I have found that oddly, many teachers who have taught "advanced" level kids in the past tend to want to stick with the mindless multiple choice method and get by on the strength of their good lectures, etc. This is not the way education is today. For G-d's sake, some of my least able writers and readers flourished when they had the chance to do a Power Point presentation for a project.
I'd also be happy to help you with a supplemental reading list.
And yes, I think I would have strangled my kids if i had home schooled them!