Why not just take both? My point is that there will be almost no difference, for MIT at least, in improving the score. The goal is just to demonstrate the ability to handle the work environment. A 750 on the math 1 vs a 730 on the math 2 may not even be better. If the student can only take one, I would recommend the one that has been taken before and the one that is more in line with the student’s level of math education, which seems like math 2.