The difficulty is above average. The "three models" test of the senior high school entrance examination in Xuhui District is about two weeks before the senior high school entrance examination, and the difficulty is above average. The three mock exams all have the same function, that is, "promoting teaching through exams" and "promoting learning through exams", but there are still obvious differences among the three exams. The purpose of the three simulations is to always insist on teaching research, especially the research of exercise teaching, do a good job of statistical analysis, do a good job of targeted comments, and give students guidance on learning rules.