I know, it feels like 'having the experts' in hand will make all the difference, but realistically, it's better to 'at least ask' for what you need now, NOW. You can explain that you made an appointment for the testing, and would like the school to 'show some good faith' by making an experiment now, since he is unhappy NOW.
You dont' have to be 'confident' just keep calmly asking for the 'next right thing to try.' No one really knows the future, but the sooner you start trying things, the sooner you will know 'what doesn't work.'
Best Wishes,
Grinity
