<p>What you just listed as extracurriculars are all really great things. Before spending a lot of effort studying for the SAT, I would definitely take the ACT, because while I didn’t [take the ACT], a number of my friends have done significantly (equivalent of 200-300 points) better on the ACT than SAT.
Unrelatedly, though, I think you’d be better off taking a multivariable calculus course if you can.</p>