Large classroom variance of student age is prevalent in developing countries, where achievement tends to be low. This paper investigates whether increased classroom age variance adversely affects mathematics and science achievement. Using exogenous variation in the variance of student age in...

Using a randomized experiment in 200 Bangladeshi villages, we evaluate the impact of an over-the-phone learning support intervention (telementoring) among primary school children and their mothers during Covid-19 school closures. Post-intervention, treated children scored 35% higher on a...

Large classroom variance of student age is prevalent in developing countries, where achievement tends to be low. This paper investigates whether increased classroom age variance adversely affects mathematics and science achievement. Using exogenous variation in the variance of student age in...

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...

Large classroom variance of student age is prevalent in developing countries, where achievement tends to be low. This paper investigates whether increased classroom age variance adversely affects mathematics and science achievement. Using exogenous variation in the variance of student age in...

How students’ non-school inputs respond to ability grouping may explain the currently mixed findings in the literature about the impacts of tracking. Using data from South Korea, where students are randomized into middle schools under the country’s equalization policy, but sorted into...