10. Use poor spelling or poor grammar _ This one should be pretty obvious. Academics on admissions committees are generally high achievers with high standards who won't disregard even simple typos. If your personal statement is not technically perfect, it can make you seem sloppy, lazy, or inattentive, which are not qualities anyone wants in a future colleague. Remember that the people skimming your essay are seeking a reason to reject your application and make the pile of possible admits smaller. Always get someone with strong writing skills to review your essay.
Let us move on to the contents of the personal statements. As such, there is no one proper way to inscribe personal statements. However, generally, the academic officers who read your essay will be interested to look into two important aspects emerging from the statement. One being how you are presenting the evidence of your achievements that is not reflected anywhere else in your application; the other being the description of how and why the episodes of your life have shaped your attitude, focus, and, of all your intellectual verve.