I would call a meeting with all his teachers being present to go over the IEP. You should be having a transitional IEP for him to head to high school. Request teachers that typically teach 9th grade english, math, science, etc., be invited to the transition IEP. The resource room teacher is responsible for making sure teachers receive a copy of the accommodations. With it being so late in the school year I would make copies and E-mail the teachers letting them know you want to drop a copy of his IEP to them on this date at this time if it is convenient. You are not requesting a Parent Teacher Conference you just want to make sure they are aware of his needs.
Write a letter to the special education supervisor with concerns. Good Luck!
Shel
If your not kicking hard enough your not making waves!