Read your essay backwards. This may sound a bit silly, but when reading in sequential order, your brain has a tendency to piece together missing information, or fill in the blanks, for you. Reading each sentence on its own and backwards can help you realize not only typos and mistakes in grammar, but that you may have forgotten an article here and there, such as “a” or “the.”
There’s no reason to rush your essay. You won’t score extra point with the admissions department for finishing your essay in an hour. Unless you’ve helped write the State of the Union, your admissions essay will likely be the most influential essay you’ve written so far, at least as it relates to your own life. Give yourself at least a week to compose your essay.