You are certainly doing the right thing by requesting testing. It is
very difficult to help a child unless you know what
the problem is
. His actions at school certainly are typical of someone with ADD. And yes, by now, he certainly may be hating school because he has such a difficult time coping with it.
I would definitely suggest doing some research on ADD/ADHD so you can understand what is going on. You also might want to read, The ADD/ ADhD Answer book." , by Susan Ashley.