My advice to you is: choose a book that focuses more on test taking strategy. e.g Kaplan. When you want to study Content or principles: try Lippincot, NCLEX3000 if you find a reviewer's question too easy, skip it..Focus on your weakness...if you are hitting 75/100 or up per practice drills, focus on prioritization questions. Test yourself in three ways: first try answering when your mind is not focused and you are not conditioned, second- answer when you are feeling okay, third- answer when you are at your best..and analyze how you are doing. focus on your mistakes- ask yourself what made you chose that wrong answer and why it was incorrect. Know and understand yourself, that's the key...