Is losing all his friends to reception classes. His nursery is busy preparing the children for starting big school and he just doesn't understand why he isn't going too. 
He has been in his class since the beginning of the last school year as he was more than ready to leave the toddler room by then, so he will have completed a full academic year there. I think the teachers may have forgotten that he is NOT going this year, and got him all excited about a transition that is not going to happen.
He is at least as academically ready to leave his present setting as the children who are old enough (he is very bright), but how do I explain to him that because of his birthday, he has another year in his current class?
He talks about being "big" , and is clearly very, distressed and frustrated by what is about to happen. His behaviour is suffering because of his frustration. I understand the reasons for his behaviour, but it is unacceptable. How on earth do I resolve the situation?