It depends on the social environment where you are. But if a child has unusual behaviors, then they will be labeled by peers and adults-- sometimes "weird," "disruptive," or worse. It is much better for the child and for people in the child's environment to know the reason why things are as they are, to know correct names for disabilities and to understand that there are some extra challenges present.
For school, what do you see that makes you think there *will* be a problem but there isn't one yet? It depends on how your school handles things-- they will probably only assign a 504 plan or IEP when they really see problems, so you may need to wait some-- but I wouldn't let it get to crisis stage. They are going to need to do their own evaluation, even if you share yours. (You can make your outside eval a part of the evidence they consider, which is usually a good idea.) But there's no point in asking them to start their eval if they see no problems.
DeeDee
