S.C. Code Ann. § 59-18-340
High schools shall offer state-funded PSAT or PLAN tests to each tenth grade student in order to assess and identify curricular areas that need to be strengthened and reenforced. Schools and districts shall use these assessments as diagnostic tools to provide academic assistance to students whose scores reflect the need for such assistance. Schools and districts shall use these assessments to provide guidance and direction for parents and students as they plan for postsecondary experiences.