I don't know what to do about advanced readers in elementary; OTOH there is a fraction of the reading instruction (things like identifying a "theme," metaphor, etc.) they can benefit from; OTOH so much of what's on offer is a shoe on the wrong foot, regardless of grade level.
This may work better because it is a highly gifted cluster program, where they expect to have a wide range of (high) reading levels, but DD's class did monthly book reports this year where not everyone was reading the same book. Instead, they had to pick a book of a chosen genre and have it approved by the teacher. The book report questions were designed to work OK with advanced and basic books from the selected genre. In addition, there were books that they read together in class and discussed.
The school library seems to have books with a suggested reading level up to about 8th grade - not as high as DD would like, but still pretty adequate for now. (The school goes up to 5th grade.)
