<p>^Actually, I heard about one predictor for an MCAT being within 2 point of ACT, yes “barring screw-ups, laziness, misfortunes etc,”. It was exactly correct for my D. and a positive one since it went 2 points up. She prep for ACT for a bit (about 1 hr / day for 5 days), but prep. whole tons for MCAT. So, based solely on her experience (I do not have any other), I would say that MCAT score relates to SAT/ACT scores and the amount of effort. I do not think that D. would get much higher MCAT with more efforts than she actually has put in. The reason for my statement is that her practice score at the end of prep. period was pretty stable and her real score happened to be 2 point below her best practice score, which some said is also a good predictor.</p>