“the National Center for Education Statistics (NCES) released new data showing a dramatic decline in test scores among American 9-year-olds since the start of the COVID-19 pandemic. The data indicate a devastating learning loss among American schoolchildren, marking the largest decline in reading scores since 1990, and the first ever recorded drop in mathematics scores.”
https://reason.com/2022/09/06/new-data-show-covid-school-closures-contributed-to-largest-learning-loss-in-decades/