How can they prove new medical school test works?

IN my humble opinion, the health professions admission test (HPAT) for entry to medical school is completely inappropriate.

It has been conceived, developed and administered by a private overseas organisation which has no connection whatsoever with this state. The Department of Education is simply buying a service from this organisation and has effectively washed its hands of any responsibility for the administration and integrety of the test.

Does any independent body act as external examiner with regard to the test? What standards apply to the test and how is it audited?