I took classes for a month, about twice a week, and then wrote a thought report. After a month, as long as you use snacks, you can basically pass the exam. Pass the certificate of completion.
However, it is very difficult to become a preparatory party. It's up to the school. I remember that four people from two classes of our major participated in the training. In the end, I was the only one who became a preparatory party member when I graduated, and I automatically became a full member one year later.
Our school is a junior college, and the basic principle is that one major is the preparatory party, and some majors will be two.