You need to rest enough. Does stress make you comfortable, try chapter XI chapter anchovies classes again, if you do not understand or suspect anything try to get help from the teachers see?
You need enough rest, not stress, chill out, let's review the lesson again if you do not understand or do not hesitate to try to get help from a teacher look.
You must have a good rest, no stress, relax, and try to review the lessons it again if you do not understand, or wondering what would seek help from teacher look.