A staff member checks the certificate of an examinee at Beihang University in Beijing, capital of China, Dec. 26, 2020. China's postgraduate admission exam kicked off on Saturday. (Xinhua/Ren Chao)

Examinees enter an examination site at Beihang University in Beijing, capital of China, Dec. 26, 2020. China's postgraduate admission exam kicked off on Saturday. (Xinhua/Ren Chao)

An examinee reads outside an examination site at Beihang University in Beijing, capital of China, Dec. 26, 2020. China's postgraduate admission exam kicked off on Saturday. (Xinhua/Ren Chao)

Examinees read outside an examination site at Central South University in Changsha, central China's Hunan Province, Dec. 26, 2020. China's postgraduate admission exam kicked off on Saturday. (Xinhua/Chen Sihan)