DS was 3.5 when we first took him for an assessment to try to sort out why pre-school was such a nightmare. We went to a highly regarded center affiliated with a fancy-pants university in No. Cal. We were fortunate enough to land with an amazing psychologist, who sussed out DS's "issue" in mere moments. She gave him the WPPSI, and gave us the news that he was PG, and really different.
She was something special - frank, informed, and soon to leave the area! She had him spend an hour in their social skills playgroup, but I think it was just pro forma - and it was an unmitigated disaster. DS stood in the corner like a deer in the headlights, crying his eyes out. Afterwards, the psychologist explained that these play groups are designed for kids who CAN, but don't yet know how to ... [insert desired behavior]. She explained that DS was not in a developmental place where he COULD [insert desired behavior]. In her opinion, the social skills group would therefore do him more harm than good.
We never went back. Over time, he is developing social skills, and I think they are on a time table commensurate with his brain development. I don't know if this is applicable to OP's child. But I don't think we should ever forget that social skills "classes" are likely to be as bad a fit as any other class for our sweet kiddos. They aren't designed for, and do not address the special needs of the PG child.
YMMV,
Sue
