Cleaners disinfect a classroom at Beijing No 12 Middle School in the capital's Fengtai district on Friday to ensure a safe testing site during the coronavirus pandemic. About 660 students are preparing to take the national college entrance examination from Tuesday to Friday at the school, the largest exam venue in the district. In Beijing, 49,225 people will take the crucial examination. (Photo: China News Agency)

The test site for the national college entrance examination, or gaokao, is ready at Beijing No 12 High School, July 3, 2020. The test, which will start on July 7, has been delayed for one month due to the COVID-19 pandemic. (Photo: Feng Yongbin/chinadaily.com.cn)

Teachers test the temperature measuring facilities at Beijing No 12 High School, July 3, 2020. The school disinfected the environment and buildings in the campus at least once every day. (Photo: Feng Yongbin/chinadaily.com.cn)

A teacher goes through the procedures in a rehearsal of the gaokaoat Beijing No 12 High School, July 3, 2020. (Photo: Feng Yongbin/chinadaily.com.cn)

A teacher installs ultraviolet disinfection lamps in a test room at Beijing No 12 High School, July 3, 2020. (Photo: Feng Yongbin/chinadaily.com.cn)

Teachers install ultraviolet disinfection lamps in a test room at Beijing No 12 High School, July 3, 2020. (Photo: Feng Yongbin/chinadaily.com.cn)

Disinfecting and protective materials are prepared on a desk outside the test rooms at Beijing No 12 High School, July 3, 2020. (Photo: Feng Yongbin/chinadaily.com.cn)