Reports from more than 11,000 parents of high school seniors and 1,000 high school principals were analyzed to learn about high school, family, and community partnerships. Analyses revealed that regardless of students’ background and prior achievement, various parenting, volunteering, and home learning activities positively influenced student grades, course credits completed, attendance, behavior, and school preparedness. When educators guided parents and solicited their participation, parents responded with increased involvement to support student success.