I took the TEAS VI a few days ago and scored an 82%... I could have done better but no matter. I'll break down my impressions for you.
ATI Study Guide & Practice tests: The ATI study guide is very detailed in areas it could be less and less detailed in areas it should be more. For example, the actual TEAS math is INCREDIBLY easy. I think I scored a 98 in that section. Its more or less 10th-grade algebra with some common sense thrown in. I took the practice test the day before the actual test and scored an 87, I believe it was a bit easier than the actual test.
Reading: I felt like this part was okay, the questions may confuse you if you try to read them quickly and answer. If you ever feel like two answers could be correct ask yourself, "what is it REALLY asking" usually that helps. I think the most difficult part for me was identifying the types of readings they presented. They will give you a passage and ask what type of passage it is: narrative, expository, entertaining, analytical etc. I think it's very difficult in most of them to differentiate.
Math: Brush up your decimal and fraction game, that's pretty much it.
Science: This is not a section you can really study for. I'm sorry to say it, but the study guide helps NONE here. The science questions are really in depth and the ones I got right were the ones I remembered from A&P as well as Micro (I really hope you were paying attention, it pays off here). I used an app called ATI Teas that did help here, I'll admit. The trial version only has a 100 or so questions but you can unlock the full version for around $12 I believe. I really found the questions in this section to be similar to this app and NOT AT ALL like others.
LA & Grammar
: I did not do well on this part, I believe I pulled a 70 at best. Do not be overly confident on this even if English is your first language. The rules of LA and grammar are asked for explicitly here and you need to know the key words. What's an adjective, pronoun, adverb? How many dependent or independent clauses are in a complex sentence. What do you join two independent clauses with and so forth. I also found they asked a lot of questions about spelling
. Not just easy spelling either, like accommodate - you better remember how many repeated letters are in certain words.
I think the app helped the most for me, and the practice test. Some questions I recognized directly from the practice test as well. Good uck!