I always believe these results are accurate, IMO. No offense to anyone.
I grew up poor and went to an all black high school, but because I had two intelligent parents, that both came from homes with two intelligent parents, I was miles and miles ahead of my minority classmates from my first day of school. Hell, I could already read pretty well when I started kindergarten. Way ahead of everyone else. In 7th grade, there were TONS of kids having difficulty with four and five-letter words on spelling test.
Many kids, some definitely white but a whole lot more minority, have to struggle and play catch up to their more well-off white and asian counterparts with less resources. It's difficult, and there is no real solution to the problem that schools, tests, gov't, ect. can provide.