If you are a full-time student, working at CVS can be quite difficult. After the interview, I was under the impression that I would be working around 15 hours a week, and 20 hours maximum. However, after becoming a member of the team, I was worked between 20 and 25 hours on average most weeks. Between the 20-25 hours at CVS, 20 hours in class, and then countless hours of school work, there was not much free time for personal hobbies or going out. I was a member of a few clubs, but sometimes I struggled to make it to those meetings as well. I would make it very clear in the interview that you are a full-time student, and that you can only work a certain number of hours. Also, whichever days you know will be large school work days for you (i.e. days when most school work is due, when project are due, when tests are, etc.) I would suggest saying you are not available those days. Note, this is all based on of my own experience at the specific CVS location I worked at.