It all depends on what the job is and how flexible they are to work with your schedule. Generally, work-study is understanding. Some jobs allow you to study while manning a desk or phone. Sometimes you can find a position getting paid to help do research tasks on your own schedule and just need to fit in 5-20 hours per week. I wouldn't commit to anything that wants >10 hours in D1/D2 year unless weekends are an option.