Big stress!

I study all days but I still cannot finish my course requirment. I even don't have one hour break within ten days or half month. I really don't how can I go on. This semester is much different from last semester. I dare not to think about tomorrow. I sent my essaies to e-tutor of my college. the biggest problem of mine is the preposition. I remeber twenty years ago my cousin introduced an English teacher to help me, the lessons that her offerd to me was about preposition.