Let me preface this by saying:
I have taken all of my pre-req courses (A&P, Micro, Chem, math, English, etc) so a lot of this was just review for me.
TEAS overall score: 86%
Percentile/Program rank :96
I ordered the ATI study manual 2 months before my exam. I studied VERY slowly(aka procrastinating) from it for about a month. I spent a few days getting through the reading section of the manual. Spent like a whole month on the math portion. I hate math so it was very slow and difficult for me to get through, lol. I spent about a week and a half on science(but I definitely felt like I needed more time here). I spent about a day on English..learning sentence structure and grammar
I took my first practice test about 2 weeks before my real exam. I had finished the reading and math sections of the study manual. I got a 78% overall on that one.
I took my 2nd Practice test the same day as my test(2 weeks after the first test) and got an 88%. I wouldn't recommend taking 2 tests in 1 day because its exhausting..but that is what I get for procrastinating.
I wish I would have started studying sooner. I did not feel like I had enough time to really review all of the science(78%). I spent a lot of time on math, my weakest area. It paid off because it went from 62% on the first practice exam to 97% on the real TEAS.
So...my advice...start studying early! Take notes from the study manual, watch YouTube videos. Some of my faves are Khan Academy, Tyler Dewitt, RegisteredNurseRN, Mometrix, to name a few. Also, for science, the questions they ask are much more detailed that what is in the manual. So the manual is just a guideline of what you should study.