The present article aims at shedding light on the issue of school effectives and the most important predictors of academic success. More particularly, definitions of school effectiveness are being discussed, a historical review about effective schools is presented, whereas some of the most basic characteristics and qualities of effective schools are being investigated. Purposeful teaching, professional leadership, high expectations of all learners along with shared goals and vision constitute crucial factors that characterize school effectiveness worldwide. The issue of the organisational aspect of school along with leadership qualities are also highly evaluated. Additionally, predictors of academic success are being elaborated with emphasis on those beyond the terms of examination performance in an effort to implement policies so as to design a school system that is both fair and inclusive, an educational environment in which learning is a non-stop procedure.