The purpose of this study is to suggest the policy implications for improving public education by analyzing the current state of school management in Korea and analyzing the correlation with academic achievement. In order to understand the characteristics of school management, this study conducted a questionnaire survey on principals. An analysis of the questionnaire found differences in the management characteristics of schools. It was also found that the principal's efforts to improve educational performance are closely related to academic achievement. In particular, principals' active human resource management to improve teacher quality showed a positive relationship with academic achievement. In addition, academic achievement also increased with periodic performance management and performance evaluation through objective indicators. School management was found to be dependent in term of the characteristics of the school principal. In particular, the personality characteristics of the principal, which were difficult to quantify, were related to the management characteristics. Therefore, this study suggests that the improvement of school management can improve the performance of the school, and that the system of selecting principals with only quantitative information has limitations in improving school education.