Frankly, never heard of giving an IQ test to a 3 year old in this day and age.
He should be evaluated on what he is doing or not doing. The IQ test in my opinion is not a valid way to make any decision except for perhaps if he is intellectually handicapped - which you don't need an IQ test to figure out.
He is just 3. And you really haven't given much info on what he is doing or not doing. It sounds like his nursery school is having trouble with his behavior.
Do you have the same problems at home? I believe the clinical standards for any behavioral problem is that it must be exhibited in two or more places.
Visit the school and watch what is going on - not only with him, but with other children. Then visit another school or two and see how things compare.
What he is doing is that he will yell or scream when kids come in his space. He doesn't want to share. If a teacher intervenes he will listen, during circle time doesn't want to pay attention & will do his own thing. If they redirect him he has a meltdown. They are very well spoken & can have a conversation with each other. If I go someplace to visit. He will clearly greet, hug with eye contact but then takes off on his own.
We are from NY. I am not sure where you are from but a psychological is automatic. This is how they scored his IQ. We then had him eval for OT & PT also.
My son is a twin. They are 3 & my only children. They don't always want to share but didn't think much of it.
He can play with his brother but often has more fun by himself. They just turned 3 in late october.
Yes, he is very young. Essentially, just not much more then a two year old. They don't easily share things at two or three. His reaction to invasion of his space is troubling. Is his brother kind of more dominate at home and invading his space?.
I think a good question for the OT is where did he fall behind and what can you do to change that.
He does obviously need to learn how to express his displeasure in a more conventional way. This is something that can be worked on at home. By the way, if this is only a problem at school - then as I earlier said, you need to visit the school to see what is going on.
One other thing, kids do not know how to deal with anger, frustration, etc. They need to be taught how to do so. There is a really neat series of books which are meant to be read aloud to children to help teach them how to deal with their feelings. You read the book to the child several (or many times). It them gives you a common vocabulary and way to deal with things. The series is called the "The Way I Feel" and a good starting one is probably - "When I feel Angry" - http://www.amazon.com/When-Feel-Angry-Way-Books/dp/0807588970/ref=pd_sim_b_5
All in all, I am assuming that his preschool noticed that he was a bit different then his twin and the other kids in the school. If it was a major problem, I would think that the professionals you consulted with would have said so. However, it does sound like there are several areas of his behavior that could be tweaked. So I certainly would get back to the OT for recommendations. But having said that. He is also very young. And the dynamics of twins can also set up some unusual problems early on.
Hope this helps.
Oh, I also meant to mention, that if you go to the book link that I gave, you will see other books in the series that might also be helpful.
I so appreciate your help. I am of course concerned. There are not many others then this. This is the main issue of him learning to cope. My other son is delayed physically so I was often holding him when infants, young toddlers so my twin A with issues above kinda was left to fend for himself. :-( It makes me feel horrible.