The achievement gap between black and white students decreases significantly when students from similar socioeconomic background are compared. what does this tell us about the connection between race, class, and educational outcomes

I believe the answer is: Much of the achievement gap can be attributed to class
No matter what races you are, if you're born in high class society, your chance of success would dramatically increases compared to normal individual.
This happen because no obtain access to higher education and potential connection that would help your career.

Read your textbook to answer that question