I just took the TEAS V a few weeks ago!
Honestly, this is going to sound so bad, but I really didn't study at all and managed to earn a pretty good score. I didn't intend to study so little, but I signed up for the exam sort of last minute and had about a week to prepare. Unfortunately, I also had deadlines for school, and my schoolwork took importance. I did purchase a study guide that basically consisted of four or so practice tests. I think it was McGraw-Hill. It did help me because the style of the questions were identical, so I would recommend it. However, I did not have the time, money, or inclination to buy the ATI materials. Who knows? Maybe I would have done a little better
Enough with my rambling though...basically, I recommend a study guide or two. Study when you can. Most importantly though, be confident in yourself and your previous knowledge. Oh, and of course, get a good night's sleep!