I have managed to keep off this thread so far, but I can bear it no longer!
The title is bloody awful! Sorry but it is! How can you be disappointed in your own child???? He is 4 years old ffs! He'll pick up on your feelings and it won't do anything for his self-confidence!
Personally I would not take my child anywhere near a school that selects them at this age, it's far too much pressure for a small child. We all have expectations of our children I guess, we all want what is best for them, but surely this is just pushing it a little too far?
Your child will not be this age forever? Instead of worrying about his short-comings, why not celebrate what he can achieve? Be thankful for his individuality. No matter how bright he is or is not, if you tell him over and over again that he can achieve anything he wants to, that he can be anyone he wants to be, if you give him unconditional love, encouragement, support and praise, then he will succeed in ways others never will. Make the most of his childhood, because all too soon he'll be grown up and you'll realise that you spent all those precious years worrying about his academic results!
There is more to life than cleverness. Kindness, generosity, understanding, empathy to name but a few. These are the kinds of gifts you want to impart to your child, they are far more important than intellect.