June 7 and 8 are arguably the most consequential days of the year in China. On those days, a stunning number of students take the gaokao, China's national college entrance examination.

To prepare for the test, third-year seniors in China have some the longest studying hours in the world, and not enough time for exercise or sleep.

It's the 40th year since the exam was reinstated in 1977, following the decade long "cultural revolution" (1966-76).As the only path to a college education, the exam is said to be one of the toughest in the world and has a lifelong impact.

Over the two days, many activities are suspended, from building construction to square dancing, to make sure there are no disturbing sounds. In some cities, cars are barred from honking their horns.

lijing2009@chinadaily.com.cn