IDEA 2004 specifically states that a child does not have to be failing in order to receive Special Education accommodations. If the child has a disability that interferes with his/her education, then the child qualifies. I, too, am suspicious of the rapid turn around in his grades, and would keep all of his graded papers.
There is a timeline to do the evaluations. If the forms you signed were consent forms, then they have either 45 or 60 calendar days to complete the evaluation.