My friend is disturbing me and I cannot study or work. What to do?

Hello doctor,

I am preparing for my entrance exam. I am not able to concentrate on my studies since four months. I got shifted to a different hostel with my friend before four months. In the beginning, all was good and he is very much talkative and creepy. He always used to sit in my room and talk about movies and games. Regularly, we together will go for movies and to a restaurant for food. I started skipping my homework in his company. A couple of months ago, I came to realize that I am wasting my time. So, I started ignoring him. I did not let him enter my room. But, I do not know what type of person he is. After all this, he always comes to me and whenever I see him I get disturbed. His room is just next to me and whenever I come out of my room he also comes and starts talking and making mischiefs. I am ignoring him and I think he has also released that. But, he is not leaving me alone. He came to my room checks my homework copy, my cupboard and used to take my book unnecessarily to his room so that I could go to his room. I do not know what to do. I have a choice to shift to another floor of the hostel. But, if I do so, then he will feel bad as he is my only friend in the hostel. But, because of him, I am not able to concentrate on my work. I need some privacy. Please give me some solution.