In an article by Karin Chenoweth and Christina Theokas it is opresented that Principals in high-achieving schools with a high percentage of students in poverty share four characteristics.
To anyone who cares about ensuring that all children are educated to a high standard, it is depressing to look at one of those graphs that show schools by percentage of low-income students on the x axis and academic achievement on the y axis. The steep slope down and to the right seems to demonstrate an iron law of probability: High-income schools have high achievement; low-income schools have low achievement. Even more uncomfortable for a country that often prides itself on having eliminated institutional discrimination, the same results can be replicated when race rather than income is used.
http://www.educationalleadership-digital.com/educationalleadership/201304?pg=58#pg58