What are the speakers mainly discussing?

W: Hi. Kevin. Your roommate told me that I could find you in the TV lounge. What are you doing here?
M: What does it look like I am doing?
W: Well, it looks like you are watching television, but we have a linear algebra mid-term tomorrow, so I thought you’ d be studying for it and maybe I can study with you.
M: Oh, well, I was just taking a break. This linear algebra stuff gives me a headache if I work on it too long.
W: I know what you mean. I’ ve been working on it for three hours already. I’ m beginning to go cross-eyed. I’ ve been trying the sample problems. I just don’t get some of them.
M: I can’t believe you are coming to me. I mean you do know what I got on the last test, don’t you?
W: Yeah, I know. You told me. I just thought two heads might be better than one.
M: Yeah, that’ s a nice idea, but…you know, I wish I knew that person in our class who got a hundred on the last test. She didn’ t miss a question. Umm…was it Elizabeth?
W: Oh yeah, Elizabeth! She is a friend of mine. She’ d be a big help right now. Why don’t I give her a call?
M: What! At this hour? It’ s already ten thirty. I don’t want to impose on her.
W: Yeah, I guess you are right, but you know what, she owes me a big favour. Let’ s at least give her a call and see what she says. Maybe going over some of the problems with us would help her review the material, too.
M: It’ s worth a try.