Help navigate school system for my son w/ sensory integration, aspergers, highly functional 130IQ?

shool won't ist since kindigarden because he is so smart, therefore no problem exists... we are of meager means anyone out there with any advise, we are now 9yrs old and in 3rd grade and struggeling everyday he has 2 brothers older and younger that i have such guilt over. with all the energy i expend on him