The study ascertained the correlation between the school-based management (SBM) level, leadership competencies of school heads, and performance rating of the secondary schools in Zambales, Philippines. The study utilized a descriptive-correlational research design, with a survey questionnaire as the research instrument. Data on SBM level were gathered through documentary analysis. The study was participated by 555 school heads and teachers among the 21 selected public secondary schools. Findings revealed that the SBM level of the schools is “maturing”. The leadership competencies of the school heads were “very competent”, as described by the school heads, and “competent”, as described by the teachers. The performance rating of the schools, in general, was “outstanding”. Furthermore, a significant difference was found between the SBM rating of the schools in terms of leadership and governance, curriculum and instruction, accountability and continuous improvement, and management of resources. Moreover, there is a high positive relationship between the leadership competencies and the performance rating of the school heads. Lastly, there is a moderate positive significant correlation between the performance rating of school heads and the SBM level of the schools. The findings were crucial for the planned intervention plan or program as well as for providing baseline information for future research projects that will provide additional correlations on school-based management, leadership competencies and performance ratings of the schools.