I found that the TEAS 6 review book was just that, a review. A very simple, vague review. The reading, math and English were about the same, I think that stuff was pretty basic- I just had to brush up on punctuation. The science was way more in depth than the review book made it. I was told it was a simple test of hs science, I never learned this stuff in hs. For example, the book reviews the integumentary system- pretty simple, what it does not go into is the layers within the layers of skin, the test asks about that. The test also asks about mitosis and meiosis, that's not in the book. All the book says is to use resources on the internet to find more info, I think that's just mean- how do you know what to look up? I found that my best help was to read through these forums and find advice on what to study, also the Kahn videos were very helpful.