I need to choose one more math class to reach a full-time status for next fall. So far I am already taking Classical Mech I from Physics Dept, Analysis I and PDE from Math Dept. I hear Analysis is already time-consuming hard class and I guess PDE isn't easy either, so I am considering to take relatively easy class as my fourth one. Taking abstract would be great, because it is a requirement for my major (math&physics major). How hard is abstract? Is it same difficulty as Analysis or easier (or harder)? I would like to make a sensible schedule and get good grades in my classes. I think numerical analysis is really easy, but it does not seem interesting to me. Or should I altogether forget about adding another math class and take something different like drawing, just so I can be a full time student? What should I do?