Is he new to MAP testing? If so, might he need someone at the school to explain that even if he doesn't know how to do something, doesn't know the answer or even where to start, that he has to answer it in order to bring the test to a conclusion? Sorry if I'm misunderstanding the situation, but he may just be under the impression that if he can't do the problem, then he shouldn't answer it, which isn't the case with MAP.