I need to learn a new way to study ASAP!!!

<p>I am a sophomore in college, and I am taking MAR200, Gen Chem2, Bio203 as far as science classes go. Im looking to go to medical school! But not it I don't find a new way to study and fast! I study at least 4 to 5 days before the exam, read the textbook, rewrite review sheets, do all recommended problem, and even work with study groups. Im the one usually teaching all the other students! Then I take the exam and blank! I get the lowest grade in the group I studied with! I don't know what else to do, PLEASE HELP!!!!!</p>