Chemical Analysis

Next Tuesday is the miderm exam of chemical analysis. Everyone studies it really hard because the teacher will flunk us if we do not do well on the exam. I study it from last Monday to now, but I still can not cinch the context of these lessons yet. On the other hand, the exercises that the teacher gave us were so much that I do not know whether I can finish it before the exam or not. I think I have to work harder from now on or I eill be flunked by the teacher.