I took it last May and passed. I used the the ENA review book. I did one test per week. I took the test like I was sitting for the exam. Timed the start and allowed the three hours permitted for the exam. I was usually able to complete it one hour and fifteen minutes. Then I would spend a couple days reviewing the test and seeing what I got wrong and why. I also counted the # of correct answers. I usually got around 107-110 out of 150 questions. You need at least 105 to pass.
The day of the exam , I completed the 175 questions in about 75 minutes and spent a few minutes reviewing my answers. I forced myself to stop. On the actual exam 25 questions are unscored experimental questions. Out of the 150 scored questions , I answered 133 questions correctly.
The most important point to learn and practice, is answer the question from the nursing perspective. A review course may help, but learning how to read the question is the most important skill you need for the exam.