Two of the world’s most prestigious universities, Oxford and Cambridge, have been accused of “social apartheid” by a prominent black British lawmaker, as new figures reveal the state of racial diversity across its admissions. One in five Cambridge colleges and one in three Oxford colleges failed to admit a single black student with A-levels (the most commonly-taken final exams in Britain) in 2015, according to data obtained by David Lammy, a former education minister. The universities, collectively known in the U.K.