How can I get my score up?

<p>I had a 790 in math first try, no prep so no worries there</p>

<p>I had a 550 in reading first try, no prep so I worry. I’ve been practicing more and I can get everything but sentence completion perfect. I just don’t know the meaning of words. How can I get better at that? I have some flashcards. Is that the best approach?</p>

<p>I had a 660 in writing first try, no prep but my practice test scores have gone up to 770 so I don’t really worry. I struggled with error ID problems. I had the last three wrong in that section almost every time.</p>

<p>Also, are PR tests easier than the actual thing or harder? Someone mentioned to me that a 750 on Barron’s books is the same as an 800 on the actual thing. Is that true?</p>