The national paper 1 is difficult, and it is mainly selected from more developed coastal provinces or central college entrance examination provinces; The national volume 2 is considered to be less difficult, and the selected provinces are mainly the central and western provinces; The national volume 1 and volume 2 were criticized as exceeding the learning reality of senior high school students. 20 16 Many provinces have produced their own papers for many years and reused the national papers. Because many self-made papers are not as difficult as the second grade, the third grade is less difficult to do, in order to give teachers and students in these provinces a transition. If this year's college entrance examination in Guizhou adopts national three volumes, the main reason is that it is less difficult to consider and more suitable for students' actual level.