got stuck on 700...(writing)

yipyip0901
Sun, 20 Sep 2009 19:36:32 +0000

I took three practice tests already…and my scores are…690,710,700…keep getting the same thing!I found out that i always got 3 wrong on the one where you have to find an error in a sentence.
What’s the best way to improve my score???i did review my mistakes,but there are always different type of problems that i cant avoid making mistakes