Teachers cheer for examinees at an exam venue at the Experimental Middle School in Zoucheng City, east China's Shandong Province, June 7, 2019. China's national college entrance examination, or Gaokao, started Friday this year. (Photos: Xinhua)

A mother cheers for his son at an exam venue at the No. 1 Middle School in Jingzhou County, central China's Hunan Province, June 7, 2019. China's national college entrance examination, or Gaokao, started Friday this year.

Examinees enter the exam venue at Tianjiabing Senior High School in Nanjing, east China's Jiangsu Province, June 7, 2019. China's national college entrance examination, or Gaokao, started Friday this year.

Examinees gesture victory in Rongshui Miao Autonomous County, south China's Guangxi Zhuang Autonomous Region, June 7, 2019. China's national college entrance examination, or Gaokao, started Friday this year.

An examinee takes an selfie with his parent at an exam venue at the No. 6 Middle School in Shijiazhuang City, north China's Hebei Province, June 7, 2019. China's national college entrance examination, or Gaokao, started Friday this year.

A teacher (R) cheers for examinees at an exam venue at the No. 10 Middle School in Guiyang, capital of southwest China's Guizhou Province, June 7, 2019. China's national college entrance examination, or Gaokao, started Friday this year.

An examinee snuggles with her family member after exam at an exam venue at the No. 1 Middle School in Yiyuan County, Zibo City, east China's Shandong Province, June 7, 2019. China's national college entrance examination, or Gaokao, started Friday this year.

A teacher cheers for an examinee at an exam venue at the No. 10 Middle School in Guiyang, capital of southwest China's Guizhou Province, June 7, 2019. China's national college entrance examination, or Gaokao, started Friday this year.

Examinees leave the exam venue at the No. 1 Middle School in Liuyang City, central China's Hunan Province, June 7, 2019. China's national college entrance examination, or Gaokao, started Friday this year.

Examinees communicate with each other at an exam venue at the No. 4 Middle School in Pingliang City, northwest China's Gansu Province, June 7, 2019. China's national college entrance examination, or Gaokao, started Friday this year.

Teachers cheer for an examinee at an exam venue at the Dayu Middle School in Beijing, capital of China, June 7, 2019. China's national college entrance examination, or Gaokao, started Friday this year.

Examinees enter the exam venue at the Liuzhou High School in Liuzhou, south China's Guangxi Zhuang Autonomous Region, June 7, 2019. China's national college entrance examination, or Gaokao, started Friday this year.

Examinees review lessons outside the exam venue at the Liuzhou High School in Liuzhou, south China's Guangxi Zhuang Autonomous Region, June 7, 2019. China's national college entrance examination, or Gaokao, started Friday this year.

Examinees review lessons outside the exam venue at the Liuzhou High School in Liuzhou, south China's Guangxi Zhuang Autonomous Region, June 7, 2019. China's national college entrance examination, or Gaokao, started Friday this year.