I used the emt achieve study guide to pass. One piece of advice i can give you is that memorization will only get you so far, you really need to know this stuff or once you actually get on a truck the real emt's will eat you alive. Good luck on your third try!
I just passed my test on Thursday man, and I still dont know how I didnt fail it. The one thing i leaned on was my ABCs. Dont over analyze a question, take it for what it is. For example, I got a question telling me that you are enroute to a shooting, police are on scene, what should you do? Dont assume the scene is safe just because the police are on scene. KEEP IT SIMPLE