So noisy central library

It's end-term examination session so I am studing in the central library nowadays. But it's quite noisy and crowded because of so many middle school and high school students. They chat very loudly and seems not to study much at the library. I wonder why they came to the university library. They seem to come not to study but to chat and hang around at nights. I hope that there is a kind of rule to bang them out of the central library but I heard that there is no such rule. Maybe students' association might do something to prevent those kids from our library. I'm planning to make a suggestion on the school hompage.