I used the ATI study guide almost exclusively, and within the last month or so before the test I used the online practice assessments from the ATI website, both A and B. These were immensely helpful. I scored about ten points higher on the Teas than I did on the online practice assessments, which seems to be the norm. So you take practice assessment A, go study everything you missed, and then take practice assessment B. You can guess what your grade will be on the actual test based on your grade on practice asessment B - it really works and is totally worth the money.