Improve Writing Score

<p>I like to think of my self as a strong writer ( published poet, nothing but A's in IB english 720+ CR score on practice tests, write for newspaper ect.) but can't seem to get my writing score out of the mid 600's despite 10-11 essays. Does anyone have any tips that I can implement before May 5- I have the blue book and went through BAron's 2400 with little difficulty.......
and if you are in an especially helpful mood you can give math tips ( 590-610 ish blah)</p>