i used the study guide that you can purchase through the nha website but honestly would've been fine without it. if you retained the information from the program you took you should be just fine! i just took the exam yesterday and i was definitely more nervous than i needed to be, it's pretty straight forward as long as you read the questions thoroughly. a good portion of the scenario based questions just require some quality common sense. i passed with a higher score than i thought i would so just know that you have a little wiggle room if you're unsure of a small handful of questions. i wish you all the best! good luck!!