Shandong, Hainan, Liaoning. Five-year simulated three-year college entrance examination, commonly known as "53", is actually a college entrance examination review book, which contains simulated college entrance examination questions in the last five years and real college entrance examination questions in the last three years. The reason why Shandong, Hainan and Liaoning apply the 53 college entrance examination is because it directly hits the college entrance examination. The simulation questions are all based on the characteristics of the annual college entrance examination reminder, as well as the real questions of the college entrance examination in the last three years. Students must do it, fully feel and approach the college entrance examination.