Grandma's birthday can be taken as a leave of absence for college students, depending on the attitude of the guide. Some guides are very demanding and may not allow you to take time off, because as a college student, the most important thing for you is your grades. If you really want to ask for leave, you should also worry about your studies. If there is no class, it should be no problem. If you attend class, the teacher will deduct your grades. These class results will affect your final grade, and the final grade will also affect your evaluation and scholarship, so the topic is mainly decided. Asking for leave mainly depends on the tour guide, because some tour guides put themselves in your shoes and may not ask for leave.