It is very difficult for doctors in Northeast Normal University to retest English. According to official website of Northeast Normal University, Northeast Normal University only enrolls 200-300 doctoral students every year, which makes the English test difficult. Moreover, it is even more difficult for doctoral students to retake English. In addition to English grammar, vocabulary, reading and other basic abilities, it is also necessary to have a certain knowledge reserve and academic research ability, so it is very difficult to retake the English exam.