Currently, school systems around the globe are focusing on student achievements empowering school leaders along with curriculum and accountability frameworks. This paper focuses on a comprehensive review of literature on the role of school leadership towards improving student achievements based on research findings and best practices. It refers to numerous research projects conducted in many different school systems based on quantitative, qualitative and mixed method approaches comprising small scale medium size and mega research projects for the benefits of all types of school stakeholders on how a leader can do his or her best to improve student achievements.