Have a clear idea of how you are going to write about yourself. Organize your thoughts and how you transmit them to paper; do not wander from one topic to another without any real linking between them. Any paper must be organized but in one where you have to write about yourself it is easy to jump around in an effort to cover more ground. Do not rush yourself in trying to write down everything about yourself without making sense.
Application essays exist because colleges want to know about the students they are admitting. Think about the admissions process from the point of view of a college: what would you know about a student like yourself? You'd know his or her grades and test scores, and which classes he or she took. You'd know about family finances, thanks to and any other financial aid information that might have been submitted. But what about the person? Very little.
to write about yourself for your college application essay, ..
Essays are, in part, a chance for you to introduce yourself to the admissions staff at a school. The fundamentals of essay writing still apply—you have to use correct grammar, and follow a logical course in your arguments, and correct any spelling errors, just like you would in an important essay for a class—but that's not the main point. Whatever the specific question is in your essay prompt, there are other questions beneath the surface. "Who are you? What makes you interesting? Why should we expect you to succeed here at our school, and afterwards, when you go out into the world?"