This dissertation comprises three independent chapters in applied microeconometrics.This dissertation comprises three independent chapters in applied microeconometrics. In the first chapter, we investigate the effects of earlier and longer exposure to compulsory education on students’ academic performance. Previous studies were limited because they often used variation in only one variable, school entry age or duration. We overcome this limitation by using Brazil's 2006 school reform, which lowered the compulsory school entry age and increased its duration. Furthermore, we examine the heterogeneity in the effect of the reform based on students’ preschool educational status, thereby providing different policy implications for countries wher...