why must we pay...

I really don't understand why we have to pay sixty dollars to hold our classes. Never have. Either you show up or you don't. I mean don't get me wrong. I do understand. I'm just annoyed that I have to stand in this freaking line because I don't even know if I actually have to pay the sixty dollar fee or not. Being a graduate assistant makes things confusing. It's good but I don't always know what I'm supposed to be doing at all times. I'm gettng close.