I don't know if you ever got the school to give you the test scores but I ran across a reference to FERPA that seems to apply to this situation.

"Does a school have to explain or interpret education records when requested by a parent or eligible student?"

"FERPA requires that an educational agency or institution respond to reasonable requests for explanations and interpretations of education records.  34 CFR § 99.10(c)"

http://familypolicy.ed.gov/faq-page/12#t28n92