What are my chances in the following schools?

I believe I can take the SAT again. I have not looked into what the requirements were for taking the SAT as a college student and am unsure if I am able. I don’t see why I couldn’t. The SAT seems like something I would need to study for to really improve my score on, despite my increasing knowledge. The real reason I am hesitant on retaking the SAT is because of what the transfer requirements of Cornell (my number one choice) say. To transfer to the college of art and science one needs to send the scores if taken, but not if the student has not taken the SAT before. Also, I spoke to a student who graduated from my community college (accepted to Northeastern) who has never taken the SAT and has a similar GPA. These reasons cause me to be uncertain if taking the SAT again is worth it (studying for the SAT besides my classes, possibly achieving a second poor set of scores). Although I don’t doubt I could study enough to get a good set of scores if I chose to.

As for my EC’s: I have none that will shine. I work part time at a local gym (which I have worked at for approaching 2 and 1/2 years or so). This is also where I spend time exercising and changing my body. Other than those two things, I have no academic EC’s, no charity/community service work. I’m uncertain what exactly would be considered a qualified EC to be honest.
Thank you very much for the reply!