I did the math, and as long as I got a 90 on my paper, anything above a 70 gets me a B in social structures, if he does plus/minus grading. The syllabus says he doesn't, but I've heard he does, so who knows. If he doesn't do plus/minus, anything above a 60 gets me a B. A 100 would just bump me up to an A-, but that's not going to happen.
That's kind of depressing, but at least it takes some of the pressure off. Heck, I could get a 70 on that test now.