First, this site is awesome and thank you to all who posted your experiences and good tips. I've learned so much just 'listening' to you.
All I can say is that if you purchase the ATI online practice tests, don't wait until the week of your TEAS to take them. My TEAS is scheduled for this week, and I'm trying to take the ATI online practice test right now. Presently, I can't get to it on the web site. I called the company this morning and they indicated that they did a web upgrade today that will require my loading additional software and so on. They also told me to change some of my internet options, etc.---but no luck. This afternoon I can't even log on--I get a server error message; so I called them. They indicated they're having some problems with their server now and to try back in 1.5 hours. Hmmmmm.
On a related subject, if your school gives you a choice of taking the TEAS online or as a written test, you may want to consider taking it as a written test because 1) if the TEAS test site is down or goes down while you take the test, well--not good , 2) I've heard from other students that you have to scroll quite a bit while taking the online TEAS Reading section, which is at the very least a pain, and 3) you never know if on the day you take the test your school's computer network may be having an unforseen glitch, making you unable to get to the TEAS test web site at all. Unlikely? Probably. But I would have thought it ALSO unlikely that I'd be sitting here after 4 or 5 hours, still unable to get to my online practice test.
Anyway, good luck to all taking the TEAS!