Welcome!!!
When I was at that age, I argued with the teacher, then walked out of school!! If things were going way to slow, then I just zoned out.
There are lots of practicing parents on here who have BTDT, so the only thing I can add is that you should check out Ruf's and Gross's books on gifted kids.
The sections on actual kids' case histories are powerful. The part on the rate at which kids learn and how x% of their time is wasted is something to keep in mind. For MG+ kids, over 90% of their time is wasted in age-peer class groups.
