Highlight your accomplishments _ Some of your achievements may not fit into any categories on the application; talk about these accomplishments in the personal statement so they aren't left out. You could also use the personal statement to elaborate on an achievement that you are particularly proud of, but could not address in detail on another part of the app. Think of the personal statement as an opportunity to tell admissions officers anything you want them to know that wouldn't be perfectly clear otherwise. Don't be afraid to brag about yourself; your application is really all about selling a product__you__to the college.
After grammar and spelling, the next problem that needs be checked is transition. Read your essay. Go through it from end to end, and check to see if your essay flows smoothly. Does each sentence flow smoothly to the next? Does each paragraph flow logically to the next? Each statement should be connected or somehow related to the one before it, not thrown randomly together. Next, limit the use of "I" in the beginning of most sentences as it is already obvious that the essay is a piece written by an individual.