This paper aims to provide a systematic review of the literature on school effectiveness, with a focus on identifying the main factors that contribute to successful educational outcomes. The research question that this paper aimed to address is “what are the main factors of school effectiveness?”. We were interested in several descriptors such as school, effectiveness/efficiency theories, effectiveness/efficiency research and factors. Studies (published within the 2016–2022 period) were retrieved through two databases: JSTOR and ERIC. This paper defines several categories identified by school effectiveness research. Within these categories, various factors that affect the students’ outcomes and the defined effectiveness in school are listed. As the results show, the issue of school effectiveness is multifaceted, as the effectiveness of schools is a complex concept that can be measured through various indicators such as academic achievement, student engagement and teacher satisfaction. The review of school effectiveness revealed that several factors contribute to effective schools, such as strong leadership, effective teaching practices, a positive school culture and parental involvement. Additionally, school resources, such as funding and facilities, can impact school effectiveness, particularly in under-resourced communities.