Would I send H to Math Monkey?
If H does not have the strong math concepts that he has, NO! Since he loves numbers and loves doing maths, MAYBE. I'd certainly not send him if he's at the Green Monkey Troop level. For H, he's placed at the Lemur Troop level in which mental math techniques will be introduced. It'll definitely be something new and interesting to him. Besides, participating in the games will help him come out of his 'shy' self.
At the end of the lesson, I asked H whether he enjoyed himself and whether he wanted to go again, he nodded yes. So maybe we'll give it a try : )