Here are some thoughts based on my own (somewhat limited) experience...
(1) What kind of scheduling conflicts are there with 3rd grade math? Perhaps they can be resolved with a little creativity and flexibility. My DS6 misses 1st grade arts to go to 3rd grade math, but then makes up the work in afternoon during 1st grade math. According to his teacher it has worked surprisingly well.
(2) Plan for next year now. They have probably not finalized the master schedule, so if they are on board they may be able to ensure that your DS can attend the appropriate math class.
(3) ALEKS is another possibility. They could allow him to work on it at his own pace during math time.
Ultralight Hiker
