I know it is awful. There is no way I would have been brave enough to ask the school for testing - I don't think they would have anyway. I was lucky for a number of reasons that affordable testing was available (it was a stretch but doable).

I too have a quirky younger child who may or may not choose to co-operate with the tester. He may choose to give deliberately wrong answers and laugh hysterically or just say rude words.

I hope it goes well whatever you do.