I just took the TEAS today and it's not that bad. I spent most of my time studying math because that's my weakness. I didn't do as well as I had wanted to on the science portion (I scored 85% overall on science), but I did so well on the rest of the test, it didn't matter so much. There were several physics questions, some chemistry, and some general science. There were only a few anatomy questions. I got 100% on the physical, chemistry, and anatomy. It was actually the general science that got me. Of course I have not had any general science in a hundred years and I panicked instead of just using my head!
So I would suggest really studying for the parts you are weakest. I found that many of the questions I didn't know how to do, I could reason out and narrow my answers down. Much of this test is common sense and reasoning. It wouldn't have mattered how much I had studied, some of the graphs I would never have figured out. I had a study guide that was fine, but I found that this website, http://www.testprepreview.com/teas_practice.htm
, was a very good source for practice. Some of the questions on the TEAS were very similar to the ones I had seen on this site. So don't sweat it. Someone else on this site told me that the TEAS would be the easiest thing I've had to do so far, and that person was exactly right. You'll do fine, just keep your head! Good Luck!