[Feeling indecisive about which class to drop]

Hey all!
 

I'm starting the first semester of my Master's in History on Monday, but I ran into a bit of a problem. My first problem is that I have a graduate assistantship that will keep me working for ~20 hours a week. My other problem is that I managed to misread something on my school's website, and I'm taking too many classes, but I have no idea which class I should drop, since I also tend to be pretty indecisive at the worst possible moment. Currently, I'm taking:

• US History (Lecture)
• Medieval Military History (Lecture)
• Methods of Historical Research (Mandatory first-semester seminar)
• Seminar in European History (seminar)

Currently, I'm leaning towards dropping the European History seminar, since I have no idea what to expect course-wise from a seminar class other than the extreme basics, which my Research class will probably teach me. Dropping the seminar would also give me the few more hours that I would need to work for my assistantship.

Any advice would be greatly appreciated!