I'm not sure what kind of testing we would do (if anything). He always scores Ok on language assessments. But he is just not very articulate. He has a new teacher who has a Master's in special ed and she is in contact with his new SLP at the school so we'll see what they come up with, or know of a good person to do an outside eval.
Does he have issues with articulation or motor output (in terms of speech), or is it more of a language issue? Does he use age appropriate grammar? Sounds like maybe a pragmatic speech disorder but hard to tell from the info you posted and I'm no expert anyway.