Realistically how much can I improve by?

<p>I had a 490(with a 9 on essay and 1720 overall) on writing when I took it on June without any preparation. Then a 600(with a 10 on essay and 1840 overall) when I took it this October with some preparation ( not a whole lot though). I guess you have to figure out what went wrong. In my case, I’m just not a good test taker, I can write but I suck at those multiple choice questions. I’m taking them again this December and I’m hoping to get 650+ on writing section and hopefully a total score of 2100+ for the merit based scholarships.</p>