Hi! I definitely think you should get the ATI teas package. They offer two practice tests formatted just like the teas. I took the teas V last year for a program but had to take the teas VI for a new program I am applying to. I bought the V test pack so I still had the book and the practice tests are good for 2 times! I've done the practice test and they really help.
For this exam, I went to barns and noble and purchased a TEAS VI book. I felt that generally the information on the teas is more or less the same. This book I feel though had better rationales than the ATI one. I did the practice tests in both the V and VI and the online ones I still had.
As for the exam itself, for math they allow you to use a calculator. That portion became a lot easier but still know your basics and know your conversions. Get comfortable with word problems too. Just practice, most people I know freak out about the math like me since I suck but I did the best on that section. For reading I suggest looking over the authors purpose and themes/topics that's huge. Since it's the first part don't rush just breath and take it easy. For grammar
I focused a lot of my study time because it can get very tricky. Know all the grammar rules lol and finally science. It's hard, a lot of A&P so know your systems in and out to the T. Know the basic mechanics and physiology of each system. Scientific method is important too.
GOOD LUCK ON THE EXAM!!! Just remember to take a deep breath a lot of it is just nerves.