I'm about to fail out nursing school!

It sounds like you are having trouble with exam questions. Since I was (and am) a professional nursing tutor (BSN, RN), I will advise you to do what I tell my students to do: Get yourself a book called "Test for Success: Test Taking Techniques for Beginning Nursing Students by Nugent and Vitale. It will teach you how to answer test questions. Since most students suffer from test anxiety, this is what I tell them:

1. When you get your test paper, cover the answer choices with a piece of paper (your answer sheet) and just focus on the question. Look for key words or key phrases that will tell you what the question is asking about. Look for phrases like, "the nurse should NOT" and be sure you are answering what the question is asking. Once you have figured out what the question wants, unveil the answer choices. One of the mistakes often made is that a student will see an answer choice, remember something about it from the 19 chapters they just read and select it without identifying what the question is looking for. Avoid that trap and I guarantee you that your grades will rise