I imagine a 4th year would score very well on the bio section (because those passages are pretty easy when you have an idea of what they are talking about). I think a 4th year would also score well on verbal because of all the reading you do in med school. But, you don't have to do any real 'thinking' in med school (just application of stuff you have learned/memorized), so I think med students would score poorly in the physical sciences section.