Are you asking which schools cherry pick the best section scores or best overall score from a given test? For example having a 3/14/5 one time, then a 14/3/6, and then a 3/5/14 the last time to give a score of 42? Or taking the best overall score from each of these which would be 23? Yes, I realize this is an absurd example. I think GWU uses the first method described here, whereas many more medical schools will probably use the second method. I've never heard of a school averaging MCAT scores.