This paper examines the effects of high school de-tracking on Korean SAT scores. After accounting for the sample selection bias using an event study approach with matching, we identify three distinct channels of de-tracking effects: classroom effects from peer quality and teaching effectiveness,...

I explore the causal effects of single-sex high schools on long-term labor market outcomes using a unique feature of educational policy in South Korea--—the random assignment of students to single-sex versus coeducational high schools. I find that the effect of single-sex schooling on earnings...

Using quasi-randomised data from South Korea's high school equalisation policy area, we show that school-provided after-school classes reduce students' time spent in private tuition and the associated household expenditure, as well as increase their likelihood of college attendance without any...