I think you'll do fine. I just took the TEAS last night and I have to say it was the easiest standardized exam of the century. Granted the science section was random, the reading, verbal, and math were extremely easy.
The reading portion basically consisted of reading labels and understanding what they're telling you. Stuff we do on an everyday basis already! (example, the back of a medicine packet, dosage, warnings, etc) Also there were couple questions on following directions where they make you copy a string of letters, replace specific letters, cross out some, and ask what do you get at the end.
The math was simple math. I did not find the need to memorize formulas for anything. It is true there were questions that needed me to go from KG to POUNDS and another from INCHES to METRIC, and CELSIUS to FAHRENHEIT but honestly there is no need to stress yourself out!!! I answered ALL questions perfectly without knowing a single thing about formulas. From KG to LB, I knew what I weighed in KG and knew what translated to LB so I estimated. Their answers aren't tricky either, most wrong answers are way off. Inches to Metric, just use what you remember from a regular ruler, and guesstimate! Celsius to Fahrenheit, just remember in Asia, they're usually 20-30 C's and thats our normal 60-80 F temp.
Verbal, you just have to know your punctuation! When to use a comma, semi-colon, colon, quotation marks, parentheses. You can't study vocab, either you know it or you don't, theres only 3-5 questions on vocab, simple! Put in the context ,they ask you which definition fits.
The only thing I thought I was do differently was GLANCE OVER SCIENCE!!! lol but it was so random!!! They literally asked a question from ALL sections of science. Even things we learn in elementary, like plants and rocks (1-2 questions).
ANYWAYS, hope I helped! GOOD LUCK! You'll be fine! I only studied 4 hours before the test, took a practice test and thought it was a joke! I think people overly stress themselves and don't give themselves enough credit. I used the free prep book they had on rapid share so I can forward you the book. GOOD LUCK!!!!!! Don't psych yourself out!