Med-Surg Success: A Course Review Applying Critical Thinking to Test Taking (Davis's Q&a Series): Kathryn Colgrove, Ray Huttel: 9780803625044: Amazon.com: Books
I LOVE this book! It did a great job training my brain to think the way it needs to to pass the tests. Every question has the rationals for both the right answer(s) and the wrong answers plus a test taking tip that relates to that question. The book is divided into subjects like Cardiac, musculo., and respiratory. It is then further divided into subsections like asthma, COPD etc.
This book made a big improvement in my grade :)
Another book that is popular is the green saunders PN NCLEX book. I borrowed it once from a friend who is a semester ahead of me and I loved it! It gives a breakdown of each section along with NCLEX Qs at the end of all the sections. I plan on picking it up for my next semester.
Good luck in school :)