Make sure you use all the time allowed! I panicked when I took the test and did not use all my time. I am retesting on the 31st. Do what was said above, study at least 2 hours a day. I also purchased the McGraws Hills. I feel that goes more in detail on the Science and explains math a lot easier than the TEAS manual does.
There was a free TEAS prep course at the school I will be attending. She did a placement test for all of us to see where we stood (Except science). The math she went over very well and I feel so confident in math (taking the test this friday 8/3). Before I felt that I would fail the Math altogether. The science all she did was read the lessons from the book. She couldn't even pronounce half the words! So I stopped going because I didn't want to waste 6 hours a week on something I can just read on my own.