Do charity activities. According to the national party media information platform, this activity selects high-quality teachers in the whole city, and provides free knowledge collation, summary and online Q&A for junior high school students in compulsory education stage by using the Internet. During the trial period of public welfare activities, the ninth grade math and physics subjects will be given counseling and answering questions every Saturday and Sunday 16- 17. This Saturday and Sunday, the third course will meet the third grade students.