Joining the league is easy. Find the league secretary of the class, who used to be a league member. League relations will be automatically transferred to universities, and students will keep them after the college entrance examination in some areas. This requires students to take it to the League branch where the university is located. If you are not a league member before, you need to submit photos, fill in the basic information form and the application form for joining the league according to the procedure, and wait for the approval of the league organization.
Universities can join the league, but the number of members is small. Different schools are different. You can consult teachers and prepare corresponding materials.