Russell Hobby, general secretary of NAHT said: “The report provides yet more evidence about the impact of deep-rooted social inequality on education and consequent life chances.
“Schools daily do their utmost to address this issue, indeed they are our most powerful resource, but inequality and poverty makes their work harder.
“Without their effort and dedication the situation would be even more acute.
“These limits are imposed not by a lack of will or passion. The problem lies, as it has done for decades, in approaching this as purely an educational rather than a social problem.”