New SAT Data Highlights the Deep Inequality at the Heart of American Education - The New York Times

Starting very early, children from rich and poor families receive vastly different educations, in and out of school, driven by differences in the amount of money and time their parents are able to invest. And in the last five decades, as the country has become more unequal by income, the gap in children's academic achievement, as measured by test scores throughout schooling, has widened. 

"Kids in disadvantaged neighborhoods end up behind the starting line even when they get to kindergarten," said Sean Reardon, the professor of poverty and inequality in education at the Stanford Graduate School of Education...

https://www.nytimes.com/interactive/2023/10/23/upshot/sat-inequality.html