Class ab postgraduate entrance examination is designated by the Ministry of Education according to the level of economic and educational development. Generally, the score of Grade A is about 10 higher than that of Grade B. Grade A is 265,438+0 provinces and cities (municipalities directly under the central government) such as Beishangguang, and all belong to Grade A except Grade B. Grade B includes Inner Mongolia, Xinjiang, Tibet, Ningxia, Guizhou, Guangxi, Hainan, Qinghai, Gansu, Yunnan and other provinces (autonomous regions)/kloc-0.