Work study jobs vary a lot. Some of them are just wiping whiteboards after the lecture ends in the 300 person classrooms or walking around the library taking headcount every 30 mins. Front desk shifts at the dorm were also another easy one; hand over a package every now and then just do homework or slack off otherwise. Other ones probably work you like a dog and it isn't clear to be fair what the best ones might be as far as working in homework at the same time unless you get an upperclassman to tell you.