The SAT and ACT are standardized test that high school students take during their junior and/or senior year. It is recommended that students take the PSAT (Practice SAT) sometime during their sophomore or junior year before taking the SAT. Many major universities require getting a certain score on each test before allowing a student to be admitted. Click on the following links to get SAT and ACT preparation material.
SAT/ACT Prep Classes
http://www.carolinacollegeprep.com/
https://www.800score.com/sat-south_carolina.html
SAT Tutoring
https://www.thumbtack.com/sc/columbia/sat-tutoring/