<p>What is this Grammatix I constantly hear of? Is it just like a normal prep book, like Princeton Review, Kaplan, etc.? How do I get it? Do they sell it at Barnes and Noble?</p>
<p>I heard it's really good for Critical Reading, which is what I need to improve on.</p>
<p>Any other book good for CR? why? Also, can you say what your score increase in CR was after using the book?</p>