Students prepare for the upcoming postgraduate admission test at a college library in Shenyang, Liaoning Province, on November 19, 2018. The 2019 entrance exam for postgraduate studies will be held from Dec. 22-24, with 2.9 million people set to take the test. (Photo: VCG)

Students prepare for the upcoming entrance exam for postgraduate studies at Hebei University of Engineering in Handan, Hebei Province, on December 17, 2018. (Photo: IC)

A student prepares for the upcoming postgraduate admission test at a university in Wuhan, Hubei Province, on December 16, 2018. (Photo: VCG)

A student yawns while preparing for the upcoming postgraduate admission test at Hebei University of Engineering in Handan, Hebei Province, on December 17, 2018. (Photo: IC)

A student reads a book and prepares for the upcoming postgraduate admission test with a blanket draped over his head and shoulders at the library of Huaiyin Normal University in Huai'an, Jiangsu Province, on December 19, 2018. (Photo: IC)

Students prepare for the upcoming postgraduate admission test at a college library in Shenyang, Liaoning Province, on December 15, 2018. (Photo: VCG)

A student prepares for the upcoming postgraduate admission test on the rooftop of a teaching building at a university in Wuhan, Hubei Province, on December 15, 2018. (Photo: VCG)

Students read books and prepare for the upcoming postgraduate admission test at a college canteen in Zhengzhou, Henan Province, on December 9, 2018. (Photo: VCG)