You need to do many things that you do not usually have to do at home by yourself when you live in the domitory. For instance, washing clothes, washing dishes, sweeping and mopping the floor are what you need to do and no one would be willing to help you. All you have to do is to handle them by yourself not your parents.
It is easier to be distracted by other students in the dormitory. Such as, if other students do somethings but study, you can not pay attention to your homework and test. As a result, the efficiency of your study will decrease. So you need to spend more time to prepare for your homework than other students.
It is inconvenient for you to go wherever you want or what you need in the dormitory than at home. Like, you need some pencils for writing, only can you buy them when you go home. You are enables to go shopping with your friends or to go to cram school after a complex process. It is hard for many students to put up with the inconvenience of those things.