<p>SAT is an easy test based primarily on the middle school academics. Many top kids burned because they did not realize that they actually have to refresh material way back from the middle school.<br>
MCAT seems to be more or less based on college level and most will not know many answers. However, keep in mind that there are MS who also take MCAT and they might know much more in certain section than your average UG pre-med.
And again, most spend few hours preparing for SAT / ACT. And again, most pre-meds 9with exceptions noted here on CC) would spend few months (few hours every day) preparing for an MCAT.
I am not sure how simple (actually degrading) test like SAT could be compared to an MCAT.<br>
However, there is a correlation (again with exceptions) between ACT and an MCAT. and again, this correlation could exist mostly because of certain individual work habits, not any other aspects. Say, if you have not prepared for one but work very hard preparing for another, I do not think that there will be much correlation between your ACT(SAT)/MCAT test scores.</p>