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. (Photos: Xinhua)

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.

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.

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.

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.

An examinee takes a selfie while lining up to enter the examination sites at Central South University in Changsha, central China's Hunan Province, Dec. 26, 2020. China's postgraduate admission exam kicked off on Saturday.

Examinees queue up to enter the examination sites at Central South University in Changsha, central China's Hunan Province, Dec. 26, 2020. China's postgraduate admission exam kicked off on Saturday.

An examinee reads 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.

Examinees queue up to enter the examination sites at Central South University in Changsha, central China's Hunan Province, Dec. 26, 2020. China's postgraduate admission exam kicked off on Saturday.

Examinees prepare to enter an examination site at Beihang University in Beijing, capital of China, Dec. 26, 2020. China's postgraduate admission exam kicked off on Saturday.