It's hard to tell. School is different. Some of the rights and scope of work of various departments were not only determined at the time of their establishment, but also constantly changed by various ministers. To put it bluntly, the right has nothing to do with the above, and it was won by yourself. The specific work is actually the same. I suggest you ask the old members of your school. However, when recruiting new students, the students' union will clearly write down the situation of each department.

Practice Department: Carry out various practical activities to provide students with opportunities to cultivate their hands-on ability and practical ability, so that students can understand life and feel nature through practice.

Youth Department: If I guess correctly, it should be the same as the Young Volunteers Association. For example, organize members to go to the countryside! Carry out some voluntary activities at school and so on.