Register for the SAT (you will need to log in with your CollegeBoard account!)
If you qualify for free/reduced lunch, SAT registration fees can be waived! See your counselor/college adviser for testing fee waivers.
Find out which schools superscore the SAT and superscore the ACT (you should always contact the admissions office to double check!)
If you are having a problem accessing your College Board account, call 866-756-7346