Often, the first draft is not the essay you originally envisioned. You might even discover that your ideas about your theme have changed as you have been writing. If you do not like the way certain sections are stated, re_arrange them. Once you are pleased with the body, make sure the conclusion and introduction still match it and complement the way you see your topic at this point. If not, rewrite them to fit the essay you did write and the way you see your topic now.
Having known about the importance of personal statement, the next question emerging in our mind is that how to write it? Take a blank piece of paper and brainstorm a list of your skills, work experience, personal interests and qualities which are relevant to your application. Jot down these issues before you carve sentences and paragraphs. Be personal and concrete. Tell issues which makes your application unique from others. Be enthusiastic and show what you have actually done, and why you found them interesting. It may be very difficult for the academic officers to select you if your personal statement is not up to scratch, particularly when there are thousands of other candidates to choose from. You can qualify for the desired university only by writing a perfect personal statement; otherwise you may miss a chance, though you are academically sound.