Tired, Pain, study

I am really tired and need to sleep,
Feel pain in my right knee,
have many stuff to study,
and bunch of papaers to mark :(
I am not pleased with my marks in this semester at all. I don't mean that I got bad marks but I could really do better than this! Yes, I could! But...
I expected something else at the beginign of the semester actually!
I have an important day tomorrow!
Let's see what ganna happen then!