Does your books have an online resource? If so they have study questions, if your teachers are like mine they pull questions from end of chapter reviews online resource and NCLEX study books. Our tests are nclex style so I use my review books for help. I have the lippincott nclex review book which also has an online resource with tons of extra questions which really help. I tend to get stuck with two answers as well and I look for what is the most important, which one covers both answers, or which one has a definitive( always, every) those may not always be right. I wish you all the luck!