My point of view is necessary, but the effect is average. Because for children with poor foundation, the characteristics of class education determine that the knowledge he absorbs from remedial classes is scattered. In order to take care of most students, teachers can't give very targeted counseling in class. On the other hand, students with poor foundation, their own learning methods and a series of links will not be very scientific and reasonable, so it is obviously difficult to collect and sort out their own knowledge in remedial classes. My suggestion is to find one-on-one tutors and give them special guidance. If it is algebra, the focus is on solving equations and functions and answering key questions. If it's geometry, don't make a special proof of congruent triangles. When giving guidance, we should pay attention to asking children to take notes and homework carefully, and only after certain special training can they improve their grades.