Straight from the College Board themselves: https://research.collegeboard.org/media/pdf/osp-technical-report.pdf https://research.collegeboard.org/media/pdf/os

Straight from the College Board themselves: https://research.collegeboard.org/media/pdf/osp-technical-report.pdf https://research.collegeboard.org/media/pdf/osp-technical-re... That report also references another study showing that each hour of tutoring was associated with an increase of 2.34 points on the SAT score which unfortunately is behind a paywall: https://www.researchgate.net/publication/282492223_Preparing_students_for_college_admissions_tests https://www.researchgate.net/publication/282492223_Preparing...