It's my understanding that HG kids can grasp content without as much repetition as normal math curriculum. So, even if you accelerate him another grade in a curriculum, it still might seem slow/drudgery. What I want is compacted curriculum and depth--Maybe asking to pretest, skip homework to every other if it's the same topics over and over. You might ask for modifications rather than acceleration (at some point you may hit a wall like we did when teachers/school refused to do Algebra with 8/9 yr old because under NCLB teachers have to be highly qualified for secondary ed courses).
Maybe look at your curriculum and look for alternatives before skipping ahead fast. Just something to consider.
