Remember, your personal statement is 'personal' in nature so it is in your best interest to be sure that all the information you provide is in fact your information. By starting with one sample and taking some ideas, then moving on to another and taking additional ideas, and so on, you allow your true self to come out in the finished product and this will give you the best shot at gaining access to the school of your choice.
oMake sure you haven't constantly used the same word in the same paragraph. This can be very irritating to the admissions officer and it only needs a little more thought to re_word or, very often, it can be omitted without affecting the sense. A thesaurus is useful for finding alternative words.