Drawing on high school data from the National Assessment of Educational Achievement (NAEA) in 2019 and 2020, we examined the deepening educational gap caused by COVID-19. Our results showed that the time spent using electronic devices increased in 2020, when online classes were conducted due to COVID-19 compared to 2019, whereas there was no significant change in the time spent on private education. Also, it turned out that the average math score did not change significantly in the upper and middle ranks in 2020 compared to 2019, but a sharp drop occurred in the lower ranks. In addition, the gap in average math scores between high-performing and low-performing students in schools in metropolitan areas widened significantly in 2020 compared to 2019. Meanwhile, multilevel model analysis results suggest that the deepening of the educational gap during the COVID-19 period was mainly due to student characteristics. Finally, quantile regression results showed that high-performing students had even higher academic achievement, while their low-performing counterparts had lower academic achievement in the wake of COVID-19. Even in the case of low-performing students, however, the negative impact of COVID-19 tended to decrease when school-level variables were controlled for.
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