An invigilator hands out national college entrance exam papers to students inside a prefab classroom in Yushu Tibetan Autonomous Prefecture, Northwest China's Qinghai province, where a powerful earthquake in April killed over 2,000 people, on Monday, June 7, 2010. [Photo/Xinhua] 

Police officers patrol near a sign that reads, "No tooting during the exam," outside a school in Jijiang city, East China's Fujian province, on Monday, June 7, 2010. [Photo/Xinhua]