Teachers cheer for examinees at an exam site in Beijing, capital of China, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Ju Huanzong)

A teacher cheers for an examinee at an exam site in Beijing, capital of China, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Ju Huanzong)

Examinees wait to enter an exam site in Beijing, capital of China, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Ren Chao)

Examinees wait at an exam site in Beijing, capital of China, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Ju Huanzong)

An examinee waves to teachers at an exam site in Hohhot, north China's Inner Mongolia Autonomous Region, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Li Zhipeng)

Examinees review before exam at an exam site in Beijing, capital of China, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Ren Chao)

An examinee prepares to enter the exam site in Changsha, central China's Hunan Province, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Chen Sihan)

Teachers cheer for an examinee at an exam site in Beijing, capital of China, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Ju Huanzong)

Examinees enter an exam site in Xining, northwest China's Qinghai Province, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Zhang Long)

Examinees wait to enter an exam site in Beijing, capital of China, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Ren Chao)

Teachers cheer for examinees at an exam site in Beijing, capital of China, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Ju Huanzong)

Examinees enter an exam site in Beijing, capital of China, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Ren Chao)

An examinee claps hands with her teacher at an exam site in Hohhot, north China's Inner Mongolia Autonomous Region, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Li Zhipeng)

A parent carries an examinee with motorcycle towards an exam site in Changsha, central China's Hunan Province, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Chen Sihan)

Examinees enter an exam site in Fuzhou, southeast China's Fujian Province, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Wei Peiquan)

Examinees queue for temperature check before entering an exam site in Chifeng, north China's Inner Mongolia Autonomous Region, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Bei He)

Examinees enter an exam site in Changsha, central China's Hunan Province, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Chen Sihan)

An examinee reviews before the exam at an exam site in Wuhan, central China's Hubei Province, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Photo by Wu Zhizun/Xinhua)

An examinee hugs her teacher before entering an exam site in Beijing, capital of China, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Ju Huanzong)

Teachers cheer for an examinee at an exam site in Beijing, capital of China, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Ju Huanzong)

An examinee reviews before the exam at an exam site in Xining, northwest China's Qinghai Province, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Zhang Long)

An examinee claps hands with her teacher at an exam site in Beijing, capital of China, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Ju Huanzong)

Examinees take selfies with their parents before the exam at an exam site in Changsha, central China's Hunan Province, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Chen Sihan)

Examinees enter an exam site in Beijing, capital of China, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Li Xin)

An examinee prepares to enter the exam site in north China's Tianjin, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Li Ran)

A teacher cheers for an examinee at an exam site in north China's Tianjin, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Li Ran)

Examinees enter an exam site in Beijing, capital of China, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Li Xin)

An examinee hugs her mother before entering an exam site in Beijing, capital of China, June 7, 2022. China's national college entrance exam, also known as Gaokao, started Tuesday this year. (Xinhua/Li Xin)