1, comprehensive knowledge points. The practice of weak points in mathematics is targeted and not comprehensive enough for the weak points of students' knowledge. The points in the canon involve every knowledge point in the students' learning process, and the knowledge points are comprehensive.
2. The difficulty is moderate. The difficulty of weak points in mathematics is different, which is not suitable for all students to practice exercises, and the improvement effect of students after practice is not significant. The exercises in the middle of the textbook are moderately difficult, and there are no exercises that are too simple and difficult, which are suitable for all students. Therefore, the ideas in the book are good.