I just took the TEAS V today. I received an 85%, which is in the 95th percentile in the nation.For the past month, I have been going over the ATI study manual and taking notes on what I did not know. I thought that as far as the reading, math, and english sections went, it was pretty much exactly like the study manual. I knew all of the information well by today, so I found those sections to be quite easy. I'm not a 4.0 student either--I'm a "B average" student, you could say.
As for the science section...The difficulty of the questions is hard to measure. I studied all of the information very well in the manual, but on the 1st online practice test I took, I got ~50%. I went back through my study guides and really tried to grasp the information beyond just memorizing definitions and such. Some questions you will know if you simply memorize the information. Truly understanding the information is very helpful though. If you understand it, you should do well. I spent many hours taking notes on the science section, but I probably could have understood it better, which is reflected in my score. Some questions I really thought came out of nowhere too and weren't exactly in the manual, but my previous knowledge from my science classes helped me figure it out. These also could have been the unscored questions, who knows...
My questions seemed to lean more toward biology and chemistry, and then anatomy/physiology thirdly.
I personally thought the online practice tests (and the study manual tests, I believe) were just slightly harder than the real test. The questions are formatted the same way, but the content was slightly easier on the real test. My real scores were a lot higher than my practice scores.
Hope this helps!! Don't stress over it. Staying calm and having a positive attitude really does help!