Haidian district. Beijing, referred to as "Jing" for short, is one of the four municipalities directly under the Central Government of China and the second largest city in China. The final exam in Haidian District is the most difficult. The general idea of its examination paper proposition also represents the direction of mathematics learning and examination, which is also in the same strain as the direction of college entrance examination reform. Haidian District, which belongs to Beijing, is located in the west and northwest of Beijing, bordering Xicheng District and Chaoyang District in the east, Fengtai District in the south, Shijingshan District and Mentougou District in the west and Changping District in the north. There are many universities and places of interest in Haidian District, such as Peking University, Tsinghua University, China Renmin University and Beijing Normal University. The Summer Palace, Yuanmingyuan and Xiangshan are all located in Haidian District.