Synchronization. According to Sohu Education Network, extracurricular remedial classes and textbooks are usually synchronized, that is, the contents of remedial classes and textbooks are the same. This is because the purpose of extracurricular tutoring classes in mathematics is to help students consolidate and deepen their mathematics knowledge and improve their mathematics ability. School textbooks are compiled according to the syllabus formulated by the Ministry of Education and are the main teaching materials for students' classroom learning. If the content and teaching materials of remedial classes are not synchronized, it will lead to confusion and disharmony of knowledge between schools and remedial classes. The advantage of synchronization is that students can study and train more deeply and systematically in remedial classes, and consolidate and expand the knowledge they have learned in school. Tutorial classes can provide more exercises, problem-solving skills and answers to help students better understand and master mathematical knowledge points. At the same time, teachers in remedial classes can provide personalized guidance and counseling according to the actual situation of students to help overcome difficulties and problems in learning.