When you choose someone to look over your admission essay, you should choose someone who will not be afraid to tell you like it is. In other words, don't just show it to your mom or your significant other. When you show it to someone who isn't afraid to give you criticisms then you are doing yourself a giant favor. Remember, those who review it when you turn it in will be looking not only for the good, but the bad as well. If your statement is not among the good, then it will get weeded out with the rest of the bad.
Now you are looking at the remaining 20% of your word limit being your conclusion. Percentages may vary if larger word limits are being offered. Ensure you state why you are interested in this field of study; state the key points from the body of your essay (e.g. accomplishments, experience and interest). Ensure that you keep it brief, to the point and leave out the clichés. Just as you started your personal statement with an attention grabber, make sure you finish your personal statement with one or two sentences that are positive and leave the reader remembering your statement while they are reading the next few.