I studied every day for two weeks. I did the entire official study guide from ATI cover to cover. Then, I did the two online practice tests from ATI the day before the exam to brush up on weak points. I thought the actual test was easier than the online practice tests, so I think that doing the online practice tests really prepares you well. I scored well (95%) but I tend to get As in school and test well generally. I definitely had to prepare and would not have gotten that high of a score without the prep.