1, the questions in different papers of mathematics subjects in the national college entrance examination are basically the same, but the difficulty is slightly different.

2. The national volume focuses on different regions, and the first test paper is applicable to some provinces in eastern and central China; Test paper 2 is applicable to some provinces in western China. Three test papers are used in a few provinces such as Chongqing. The difficulty of the three sets of volumes is basically the same, the third volume is the simplest, and the second volume is slightly less difficult than the first volume.