RAs for general subjects? I couldn't stand English. I'm good at writing and at writing essays specifically. I was good at reading books and understanding plot devices and the important messages within them but I just... I can't stand subjective courses like that. If the teacher doesn't like your writing style then it's all too easy for them to dock marks everywhere and fail you. At least with things like math/science, there's a right answer to work toward and so long as you show your work and get that answer, you get the marks. I muuuch prefer that. :[
This ^ I'm good at writing essays and such, but when it comes down to grammar and trying to find meanings in literature... I fail so hard :[ English is by far my worst subject, and probably the one I would drop if I could.
As for specific classes this year, I'd probably just hold on to them all. There's a couple that I find really boring and stuff, but none that are hard enough to make me want to drop them.