I need help improving my English/Writing Scores

<p>For the PSAT, I got 68 on CR and 61 for writing.
For my recent practice SAT, I got 51/67 correct on CR, with 1 omit, which roughly translates to a 50 raw score (they ranged it from 600-660) and I got 38/49 on the writing, which roughly translates to a 35 raw score (ranged from 590-690, based on mult. choice alone)</p>

<p>How can I increase these scores up 100 points or so? (1. Is it possible to do so before March? If I put it the work 2. What specific books should I use for grammar? I struggle mostly with the "improving sentences")</p>

<p>If you’re looking for a book for grammar, try The Elements of Style by Strunk & White. It’s a great book.</p>

<p>^ For writing essays! Thats like using calculus for SAT math</p>