<p>About Suleyman, keep in mind I browse this forum infrequently, but from what I’ve seen his comments seem really uninformed (but I think he’s not from the US). And it’s irritating to see the same kind of uninformed answers even after people inform him. </p>
<p>As for improving your score, use Silverturtle’s guide for Grammar, and go back to the basics for Math (Use a textbook or something to go over Geometry and Algebra) with Gruber’s Math Workbook as a supplement. As for Critical Reading get Direct Hits Volumes 1 and 2 for strengthening vocab, and the Blue Book to work out of for all of the above. Your score should go up relatively fast if you study hard from these until you get to the 1900/2000ish when it gets a bit harder to raise your score.</p>