Not sure about the exact time to do the testing. We had DS6 tested at 4years and 8 months and we feel the testing was very accurate measure of what we were seeing. I have heard that it is better to wait until 6yo as results are more accurate, but we wanted to get it done before K because we knew he would be unable to go to a regular K classroom. I don't plan on doing any testing again with him unless we need to for something. Of course, he has asked me a few times to go back and do testing with the psychologist because it was fun. But we could go to several amusement parks for less and that would be fun too : ) Good luck!
