<p>In terms of ACT vs SAT, people usually say that the ACT is more straightforward and less abstract than the SAT, but that it also has stricter time restraints. Definitely take a practice ACT and see how you do! Honestly, getting your CR score from a 700 to a 750 is a matter of like, three questions. Practice the hell out of it, and I’m sure you’ll see improvement (although that’s advice no one wants to hear :D).
I think (in my limited knowledge) that you’re a match for all your schools, except for Stanford, which is a reach even for child prodigies who cure cancer. That being said, I think you’re still a very competitive applicant. You’ll be even more competitive once you bring up your SAT a touch (although honestly, a 2200 is a good score).</p>