To students in China, the national university entrance exam in June is the most important event of the year. A small newspaper report in the Shanghai Daily reflects the importance: the city’s metro stations will give students priority access, to make sure they get to their exams in time.
On some stations of Shanghai, Metro operator Shanghai Shentong Metro Group imposes crowd-limitation measures during rush hours. However, during the national university entrance exam days, the operator has waved through students holding admission cards for the exams. Volunteers have also been deployed at stations near the exam schools to give directions. Certain stations that are located near some exam schools have lowered the volume of their station broadcasts to avoid disturbing students.
Further reading on shanghaidaily.com