Quizzes

So I have come to the understanding that having a quiz every week for a lab class sucks. It doesn't matter how much of the reading that I do or even if I look back over the lab manual I fail the quizzes. What is up with that? I think that this has to be my worst semester with having classes that I have to take quizzes all the time for. and it is REALLY REALLY ANNOYING!!!!!!!