There are two types of Personal Statement. General and comprehensive statement is often prepared for standard medical or law schools. It gives you liberty to write whatever could expose you the best. Example, tell us about yourself and your goals or why do you want to do this course? The second type asks for the response to either specific or multiple questions. These are mostly prepared by the applicant applying to business, teaching, graduate schools/ organizations/agencies. It gives you less freedom, but still important to be thoughtful and persuasive. Example, tell us about a personal quality, talent, accomplishment, contribution or experience that is important to you and how does it relate to the person you are? Remember, personal statement is not like an ordinary college essay. It is the most formal document to be written by self. If you're determined to write a personal statement, then you need to be skilful in good grammar, strong vocabulary, sentence formation, paragraph formation, editing and summarizing skills, to write an effective piece.
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.