The college entrance examination is now basically divided into national 1, 2,3 volumes, Beijing volume, Jiangsu volume, Shanghai volume, Zhejiang volume and Tianjin volume. Different types of questions have different degrees of difficulty. Therefore, it is necessary to predict by type. I have read some forecasting volumes, and it is obviously unscientific to use one volume to predict the national 1, 2, 3 exams. In addition, we should pay attention to the R&D strength of publishing institutions, such as the mathematical forecasting volume, and appreciate the "golden forecasting volume" of joint education, because this institution specializes in high school mathematics and has been intensively cultivating this field for more than ten years. The published series of college entrance examination mathematics counseling is the quality benchmark in the industry.

I don't think much of the prediction papers published by big publishing houses or teaching auxiliary companies. This kind of forecast paper often has no R&D strength. At the same time, one or two sets of forecast papers are all eaten all over the world, regardless of the type of college entrance examination or the differences in examination areas.

Now you can see why there are six versions. Is unscientific.