How can i keep my disabled child to move through grades at the same pace as his peers?

Work with the school: Public schools are better staffed to handle special needs kids & laws require mainstreaming when possible, regular assessments& individualized education plans do not apply to most private facilities.You need to get involved in the process.Realize you don't have to sign off on any program plan but should accept their best efforts.Educators are aware of their own limitations & try to do their best.

Keeping up: There are several answers to this and it depends on his intellectual level. If he is on par with his peers, i would continue to move along. Augmentative communication devises can help communicate. If not intellectuall equal, it depends on his size and age, ability to socialize, and what assistance he will need in class. Moving along might satisfy his social needs.