I didn't look at your post history, but I wouldn't put a kid through that much testing if I didn't need something for the child, i.e. if it were a normal part of a school's assessment to improve overall performance, or the child's needs were not being met at school.

I find it rather appalling that he didn't respect your wife's first reply and if you do go back in, I'd do it elsewhere--somewhere that they have more respect for your child as a person, and for your family.