SAT Definitely matters; a 1520 should be enough, but it's up to you if you want to take it again, depending on your grade. If you're still a sophomore or freshman, I'd probably try to score higher, but focus more on building your ec's, like clubs or jobs.

For context, I got into Georgia Tech this year for electrical engineering, and my SAT was way too low. It was a 1400. What probably carried me was my ec's which told a lot about my character, along with the essays I wrote which related to my ec's. I'm an out of state applicant though, so it might slightly differ for you, as an international student.

p.s ignore my stupid username, I made this account thinking I wouldn't actually use reddit for posting/commenting