504, thats what I was thinking of. I don't think he qualifies for an IEP as he has great grades. He struggles with concentrating when trying to block out the other distractions which is I think where his noises come from. I don't even know what accommodations I would ask for and I don't really trust the school who has consistently told me he doesn't need anything to give appropriate suggestions. It also doesn't help that with a July bday, he is the youngest in his class, and there are a couple of kids who are 15 months older than him in the same class. It's unfair to compare the 2 at that age, but it happens.
So, without knowing your son, it would be hard for me to give you a full list of suggestions, but just from what you described, some I might recommend would be: use of noise cancelling headphones, seated at the front of the room and/or flexible seating arrangements, a designated quiet space for independent work and tests, and possibly some sort of reward system to help your son curb the blurting out (I know that one may be the most difficult - but if other teachers have had success with a particular strategy for him in the past, reach out to them and see what worked before).