Education: school districts; letter grade system for ranking public schools; provide for. Amends 1976 PA 451 (MCL 380.1 - 380.1852) by adding sec. 1280h.

SB 378 requires Michigan public schools to receive annual letter grades (A-F) starting in the 2025-2026 school year based on five specific metrics: student proficiency in math and English language arts, student growth in those subjects, progress for English language learners, high school graduation rates, and academic performance compared to similar schools. The grades are assigned by the state education department using defined measures, such as growth from fall to spring assessments or maintaining proficiency. This directly affects all public schools in Michigan by publicly reporting their performance across these standardized indicators. The bill does not change school funding or operations but creates a new transparency framework for reporting school performance.