What prevents the man from taking the poets of 1960s class?

W: Hi, Mark, how is it going?
M: Well, not so great.
W: What’s wrong?
M: I’ve got a big problem with the poetry course that’s required for my major.
W: Is that all filled up?
M:  No, no, there’s plenty of room, but there is a prerequisite. I’ve got to take an introduction to poetry before, then I can take the special course in poets of the 1960s.  9) And the introductory course is only offered in the evening.
W: You don’t like evening classes?
M:  No, that’s not the point. I work in the cafeteria every evening. I need the money to pay my tuition.
W: Can you ask someone that could switch hours with you? Maybe you could just switch a couple of evenings since the course probably only meets two times a week.
M: I wish I could.  My boss just did me a favor by putting me on evenings. And he’ll hit the ceiling if I ask to change again.
W: Wait a minute. I have an idea. Have you checked the courses over at the community college? They might offer an introductory poetry course during the day.
M: Hey, that is a great idea! I’m free this afternoon. I think I’ll go over and cheek it out.
W: Yeah, their courses are actually cheaper, and you can transfer the credits over there.
M: Thanks for the advice, Linda. I’ll let you know what happens.
W: Sure, Mark. Good luck!