Wouldn’t he already have had all of the pre-med courses as a biology major, and therefore have had the course work tested on the MCAT?
Also, wouldn’t he need a considerable amount of additional college course work with a 4.0 GPA in order to bring his overall college GPA to a range where an MD medical school in the US is not a long shot. This can be expensive in a post-bacc program at a four year school (particularly a private or out-of-state public).