In November, I have received the opportunity to take the SAT for free due to Hurricane Irma's effect on my area. I currently have a SAT score of 1440. I got a 4 on AP chem and a 5 on AP calc. I want to go to universities like Northwestern, Duke, Johns Hopkins, and Stanford and major in biomedical engineeering. Should I try to increase my SAT score (by around 50pts) or take the subject tests?