I used the ATI testing book as a practice several days before the test and scored an 82%. I wish I had studied sooner, especially the science portion because I felt as if it was focuses a lot on chemistry and basic biology (that I haven't reviewed or thought about for awhile). What are you having difficulties with? Are you running out of time? Definitely time yourself on the practice exams and see how you do. Then, go over the sections as a review, even draw diagrams if that helps (I had to draw out the heart to trace the bloodflow to/from the lungs and body). Honestly, just breathe and actually read the FULL question. I feel like there's just so much pressure that we read the question too fast or simply assume what the question is asking. I hope this helps! Good luck!