A long thread on the power of the @OfficialSAT to find "diamonds in the rough"; discredit the work of girls, African-Americans, Latinos, students in poverty, and first-gen students; and/or put a finger on the scale for the students who least need it.
Let's start with why colleges might use the SAT. If a student's SAT measures up w/ his GPA then it adds little value, other than confirmation. People who believe in the test argue, however, that the SAT can find diamonds in the rough and identify students with inflated GPAs.
In other words, the test matters when there's a discrepancy, of which there are 2 kinds: 1. HSAT--students whose grades don't reflect their ability, aka High SAT (HSAT) group. 2. HGPA--students whose SAT don't reflect their ability, aka High GPA (HGPA) group.