Senior high school students study to prepare for the college entrance exams in a classroom in No 2 Middle School of Hengshui, north China’s Hebei province, May 15, 2016. The exam is to take place early next month.[Photo/Xinhua]

Senior high school students study to prepare for the college entrance exams in a classroom in No 2 Middle School of Hengshui, north China’s Hebei province, May 15, 2016. The exam is to take place early next month.[Photo/Xinhua]

Senior high school students study to prepare for the college entrance exams in a classroom in No 2 Middle School of Hengshui, north China’s Hebei province, May 15, 2016. The exam is to take place early next month.[Photo/Xinhua]