A college essay is a sample of your writing to help you reveal something that your grades and test scores can't- your personality. This is huge for students that might not meet the middle 50% GPA or SAT Score where an admission officer can make sense of who you are, as well as showcasing your writing skills.
Length: You should ensure that the essay is an appropriate length- one paragraph is way too short for a question that requests a 1-page response. At the same time students should not exceed the maximum page or word allowance
Topic: Read your essay aloud to ensure that the tone you desire comes across in the final product. This can help you determine if your sarcasm or humor is likely to be misinterpreted, if your emphasis is unintentionally melodramatic, if your sincerity rings ture, etc.
Format: Remember to use separate paragraphs to create distinctive sections in the essay and distinguish ideas from each other. An essay that is one long paragraph instead of being broken up into different points can be difficult to read, and the reader may get lost. Follow instructions regarding point-size, font, etc. Not doing so is a sign of carelessness.
Essays About Other People: If writing about a special person- from your own life or a famous historical figure- you should relate this person to your own life, goals or aspirations. If you don't provide some information as to why you chose this person to write about, the essay becomes a biography of someone else without any insight into why you find your subject compelling or admirable.
Essays About Challenges: This type of essay is most effective when it provides insight into who you are by describing the challenge and illustrating why it was important to you to attempt to overcome it. Describe the actions taken to work towards your desired result and tell your reader what you learned from the experience or how the experience has changed you.
Your Email Address: When listing your email address consider using a more professional address. Individuals reviewing your application and reading your essay are professionals. So, instead of an email address that entertains your friends and family opt for using your first name and last name initials (name.initial@...) or a similar identifier (initialastname@...)
Purdue Online Writing Lab: Writing the Personal Statement
IvyWise: How to Write a Great Supplemental College Application Essay
IvyWise: How to Answer Those Unusual College Application Essay Questions
Noodle: How to Answer "Why This School" on College Applications
Noodle: Pros & Cons of Declaring a Major On Your College App