If a classmate often bothers you, then I think it has actually affected your study, so the best way now is to make it clear to him and warn him not to do this in the future. Just make it clear to him this time, otherwise it will be difficult to guarantee that he will not get worse in the future. If he still bothers you like this after making it clear to him, then you can tell the teacher to get involved in this matter. If the other person bothers you after the teacher intervenes, you can only tell his parents and yours, and you must take it seriously. If he keeps pestering you and harassing you, you can call the police to solve it, which will definitely make him mainly.