"On the math and verbal SAT (a 400-1600 scale), the least socioeconomically disadvantaged student is expected to score 399 points lower than the most advantaged

"On the math and verbal SAT (a 400-1600 scale), the least socioeconomically disadvantaged student is expected to score 399 points lower than the most advantaged." Many people that are successful have a successful mindset as well. Did they also look at the disadvantaged student's home life? Do they have two parents at home encouraging them to succeed? I would also be interested to see what their education was like. If they want to a terrible public school, they will most likely score less on the SAT.