I recently took the TEAS and scored 88% on my first attempt. Here is how I studied:
I borrowed a classmates teas book and photocopied it. I started by doing all the first practice tests to see how I would do with absolutely no prep, recorded my answers and saved for later. Then I went over each section, and hi lighted/ made notes on the copy as I went along. Whenever I had a few spare moments, i would pick a completed section and quickly review, noting the things I hilited/made notes on. Then I went over the first practice tests again, and focussed on what I go wrong and why. Then I went over all the sections again. Then I did the second practice tests, and when finished went back over it, noting what I got wrong and why.
The day before the test I made separate notes on the things I wasn't 100% on, or had made mistakes on while going through the practice tests.
I got a good nights sleep, and before the test reviewed my notes.
The test is not particularly hard, you just have to cover the material. Simply skimming through is not going to result in good marks. I didn't do any online tests.
I would suggest that if one is going to do the test, find a couple other people who are doing it too, and split the cost of the book and then just photocopy it. I found the whole thing a bit of a ripoff tbh and wasn't going to spend more than I had to.
I would also suggest starting to study earlier rather than later, so that the info is cemented in your brain, instead of trying to cram last minute, which will increase your stress and add to test anxiety. I did the bulk of my studying a month before, and reviewed minimally the couple days before the test.
I hesitate to mention the actual amount of time I spent studying, because everyone is different. I didn't cover math and reading because those are strong areas for me, so I only focussed on science and grammar
. If you're not good in math, going to your schools tutoring lab would be beneficial to get comfortable with all the conversions.