Mentoring to Succeed Act of 2023 This bill requires the Department of Education to award grants to high-need local educational agencies, high-need schools, and local governments to establish, expand, or support school-based mentoring programs that assist at-risk students in developing cognitive skills and promoting social-emotional learning to prepare them for success in high school, postsecondary education, and the workforce. Additionally, the bill directs the Institute of Education Sciences to conduct a study to identify successful school-based mentoring programs and evaluate the effectiveness of the grant program established by this bill.