I need an 800 on SAT Writing/Grammar HELP!

<p>I've got a 600-640 range in grammar. My grammar just sucks since my school never taught it. I'm going through the Gruber's grammar, but what is the best way to improve grammar to an 800? </p>

<p>Other books for grammar other than Gruber?</p>

<p>Thanks a bunch!</p>

<p>Get the Ultimate Guide to SAT Grammar by Erica L. Meltzer.</p>