trying to raise Writing scores - most effective book?

Test Preparation
1

<p>I'm currently scoring 600ish on the SAT Writing section -- I have trouble with the grammar part (esp. improving paragraphs), but on the brighter note, my essays are pretty good (5's and 6's)-- So I was wondering, what specific prep book(s) is/are good at improving writing scores?</p>

<p>Thanks.</p>

2

<p>I have heard that RocketReview is good.</p>

3

<p>i heard the old barrons SAT ii writing is alrite.</p>