Thanks for all the advice. My kid decided to take Math 1 and chemistry this last sitting. Maybe the 730 Math II score is high enough for MIT maybe not. And as @rothstem points out, other schools may be looking at the highest scores without regard as to which subject test was taken. It was hard to find study time and that was spent on chemistry. In the end, decided to write Math 1 on a “wing and a prayer” after taking chemistry. I plan to update and close thread when spring decisions come out.