You need a card to enter the library study room, but you can go to the study room on the first floor of the teaching building, such as Teaching One, Teaching Three, Teaching Five, Teaching Six and Teaching Seven. There will be students studying in it at night. During the day, you can study by yourself as long as you go to the classroom where there is no class.

I don't think you are free during the day. It is strongly recommended that you go to the teaching building for self-study at night, because the library closes early. Moreover, it is the final stage, and the position of the library should have been robbed by students early in the morning ~ ~ ~