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Take a pretest to see your weaknesses then get a study book directed at those weaknesses. Pray your weakness is math. At least that gives you something solid to study. In my opinion the science section was totally random. I never saw most of those subjects/specific information in my study book. It was heavy into earth science which I think I took in middle school.

Relax. I did excellent on it and I was more than 10 years out of high school.

I agree that taking one of the practice tests on the ATI website would be good for helping you identify what areas you need to focus on. It's a bit expensive, but it will save you time of having to figure out what to study yourself and will give you more time to study.

Otherwise, use the practice tests that comes with your study guide, if there are any. You can use online resources to re-teach yourself anything you need to review. Youtube has a lot of videos. Crash Course is a good overall A&P review. Khan Academy has good detailed review of A&P (and chem) along with videos on math and grammar (English section). There's several free online TEAS practice tests you can take, and from that, you can write down what you get wrong and study that topic in more depth.