202 1 year. Mathematics is the most difficult subject in recent decades, and it is also the most difficult mathematics in 20021national senior high school entrance examination. The basic score accounts for one third, the intermediate question accounts for one third, and the difficulty coefficient is 0.34, which is a very difficult level. In the Pearl River Delta region with relatively high teaching quality, such as Foshan in Dongguan, the average score is less than 50 points. Zhaoqing, known as "Zhao" and "Duanzhou" in ancient times, is a prefecture-level city under the jurisdiction of Guangdong Province in People's Republic of China (PRC), located in the central and western parts of Guangdong Province, with a total area of 1489 1 square kilometer.