School leaders are integrating social and emotional skills content into their academic curriculum to create a supportive learning environment and improve the implicit curriculum. The Generation Schools Network (GSN) Advocacy Program is a comprehensive, multi-component schoolwide initiative designed to promote students' social-emotional competence, college and career readiness, and academic success. Overall, the GSN Advocacy Program represents a holistic approach that promotes the interconnectedness of social-emotional development and academic success, aiming to prepare students for the challenges and opportunities they will encounter. The study aimed to test for baseline equivalence between the comparison and intervention groups regarding school climate, leadership, school connectedness, emotional distress, self-awareness, self-management, social awareness, relationship skills, and responsible decision-making. This quasi-experimental process compared secondary students in the intervention group (125) participating in the yearlong GSN Advocacy Program with students in the comparison group (115). After controlling for pre-assessment variables of social-emotional competence, the analysis of covariance (ANCOVA) revealed significant improvements among students in the intervention group for total social-emotional competence and constructs of school climate and school connectedness. The program's multi-component approach, including structural support through professional development for implementers and specific social-emotional learning lessons, helped students develop social-emotional skills. Accordingly, students also demonstrated increased interaction with others, an improved sense of school connectedness, and an enhanced ability to handle emotional distress, which is crucial for academic stressors. This study suggests that the multi-component approach, including student-centered social-emotional competency instruction and environmental focus, engendered the intervention group's acquisition of social-emotional skills. Accordingly, by adopting a multi-component approach that addresses these various aspects of social-emotional programming, school leaders can create a holistic support system that nurtures students' social-emotional competence, resilience, and overall well-being. This comprehensive approach enhances students' academic success and equips them with the skills and attitudes necessary for success beyond the classroom.