"A meta-analysis of findings from 65 independent evaluations of school tutoring programs showed that these programs have positive effects on the academic performance and attitudes of those who receive tutoring. Tutored students outperformed control students on examinations, and they also developed positive attitudes toward the subject matter covered in the tutorial programs."-Peter A Cohen, James A. Kulik and Chen-Lin C. Kulik, American Educational Research Association
https://www.fau.edu/CLASS/CRLA/Level_Three/Educational_Outcomes_of_Tutoring_A_Meta-analysis_of_Findings.pdf