I'd like to add that there seems to be more of a consensus in education inequality. That is, noncognitive skills developed very early (age 0-4) are a huge fact

I'd like to add that there seems to be more of a consensus in education inequality. That is, noncognitive skills developed very early (age 0-4) are a huge factor in educational outcome and early childhood intervention is pretty close to agreed upon to be a necessary thing to improve the outcomes of children who grow up in a poor environment. James Heckman's work on the topic might be worth reading.