In order for there to be tension in your personal statement, it will help to describe a highly charged incident, part of a particularly difficult period in your life. Whatever it was, you will maintain your reader's interest for that much longer. The example below shows perfect tension and suspense build up _ "When the airmail letter arrived bearing an American stamp, I knew immediately, it was from my university with my degree results, and I tore it open as excitedly as if it were a birthday present. With trembling fingers, I took out the sheets of thin blue paper _ and my heart started to pound as I began to read."
The body of your personal statement is going to be hard work _ you need to use around 50% of your word limit to give the admission representatives concrete evidence of why you stand out from the crowd in this application process. The body is also where you will be answering questions and giving examples of experience and affects of experience. Answers and evidence need to keep reflecting who YOU really are. If you're struggling to keep under the word limit, allocate each question a word limit as well.