This study investigated the relationship between 21^st-century leadership trends and administrative practices among public elementary school heads in Diffun District 2, Quirino. While the Department of Education has set clear professional standards, there is still a need to understand how these modern roles are actually performed in local schools. This research aimed to fill that gap by examining how instructional leadership, data-driven habits, and teamwork affect school success. Using a quantitative research design, data were gathered from 102 teachers with at least three years of experience. The study focused on identifying which specific leadership behaviors serve as the strongest predictors of school effectiveness. By using statistical tools like Pearson correlation and stepwise regression, the research looked for the “success formula” that helps a school run better. The findings provide an evidence-based look at how moving away from traditional, top-down management toward a more collaborative and data-informed approach can improve outcomes. This information is intended to help the Department of Education create better training programs for school leaders in the 21^st century.