On average, "Sixth graders in the richest school districts are four grade levels ahead of children in the poorest districts." As usual with American sources, the data is also distributed by race. But race doesn't define the trend; socio-economic status does. "A higher proportion of black and Hispanic children come from poor families. A new analysis of reading and math test score data from across the country confirms just how much socioeconomic conditions matter." Of course, knowing about the impact of inequality and doing something about it are two very different things. Here's the data, based on 200 million test scores. P.S. maybe this explains results showing lower scores for online schools.
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