What else do I need for Northeastern!?

My current SAT score is a 2040 (CR-620, M-650, W-770), which I do not think stands out among others! It is an average score for the school as far as I know.

I am posting this because I have ONE MORE shot at the SAT because the last issuing of the current one is this month! I am already registered, I just am hoping someone can tell me how much I should bring up each section to become a competitive applicant. I work with a private tutor and am confident I can meet a higher score with hard work!

Besides testing here are my credentials:
4.0 Unweighted GPA
Crew Team
Marching Band- Flute
Concert Band
Key Club
Interact Club
Relay For Life captain one year
National Math Honor Society
National Science Honor Society
National English Honor Society
National History Honor Society
Science Research Competition
National History Day- 3 year participant
Math Tutor
AP Courses

BTW I am a white female, and a junior in high school. I am looking to pursue STEM, which I know can help in some cases but not in others.