<p>I used grammatix, but I didn’t find it amazingly helpful for CR. And I think their method wants you to only read the lines referenced in questions and nothing else and use only those to answer the questions, which I wouldn’t recommend. There’s a guide on here called “How to Attack the SAT Critical Reading Section Effectively” which, coupled with sufficient practice, can get you to 750+ in cr.</p>
<p>For critical reading, I reccommend getting ahold of any collegeboard SAT you can, even the old ones, and going through the critical reading sections. Noitaraperp’s guide is very good, as well. Just use those two and you should be fine.</p>
<p>Math, the books you’ve listed are fine. First, do Gruber’s, then take a test to see if you’ve improved. Then, do Dr. Chung’s if you have improved.</p>
<p>Writing, Silverturtle’s Guide is very good. Although it’s long, reading through it helps immensely. </p>
<p>Doing more practice tests/practice in general will help your score.
And, it also helps to go over the basics of each (esp. Math and Writing). If I remember correctly, Sparknotes had an online SAT grammar overview that had some part in boosting my Writing MC.</p>