I have a 2130 super score sat. 680 math, 730 writing, 720 reading. I have taken AP us history, AP English language and composition and I scored a 5 on both. I am currently taking AP chemistry, AP statistics, AP literature, and AP psychology. I plan to get 4s or 5s on all of them. I also took the bio sat my freshman year and scored a 620. I took the us history sat and got a 610, and a 620 on English literature. These scores arnt high enough to get me into McGill this year, right? I want to go to the arts and sciences school and take pre med classes. Should I take the ACT? Or should I try to redo some SAT subject tests in the next few months?
I would retake all three, they are not that difficult. You have solid foundation in lit and us history. Good luck! My daughter applied there, too 
Arts and Science are separate schools at McGill. Your SAT II’s are low for Science;
Definitely retake your SAT IIs. Also note that McGill does NOT superscore, so you’ll have to choose your highest score from ONE test. Trust me, I was bummed when I found this out too…Sorry