The Math Pipeline Readiness Project (M-PReP) was a four-year longitudinal action research project designed to increase college graduation rates by (1) improving math readiness rates through the vertical alignment of math courses from grade 9 – college calculus, and (2) supporting high school seniors in the development of a college transition plan (CTP). The project used supported dual enrollment courses to bridge the high school and college math programs. College Bridge facilitated intersegmental teams of math faculty, counselors, advisors, and administrators to engage in the school transformation project. The project paired urban partnerships with CSUs in Los Angeles County and rural partnerships with CCCs in California’s rural Central Valley.