tea or coffee

It's sunny now, I am wondering that I can go home as quick as possible, arghh.. there will be a mock tomorrow, and I haven't learnt yet, for the twice I meant. Is there any person could understand that one day before a mock, or a test, or some kind of that, we should feel comfortable and not being panic..?? how could that be if I should go home in about 5 pm and my condition is sleepy so bad.. so tired.. so hectic with many assignment.. ??!!
I am so sleepy.. hemm.. how about if I am going home now and sleep?? but there is a mock tomorrow.. argghh.. if I don't come in a class for assistance in 3 pm, I will lose some information for a mock tomorrow.. although I can search that information in my reference..
it's dillema.. sometimes I ask to myself, would it be a sin if I did not come to the class? just for some times?? I wanna go home.. sleep, then learn for a mock, make assignment, eat for dinner, or drink a tea, or coffee.. :(