Don't turn your essay in without proofreading it, and don't rely only on your computer's spell check to catch mistakes. A spell-check program will miss typos like.
It should reflect how you arrived at your professional goals, why the program is ideal for What do you want your audience to know after reading your essay? “Doctors save lives”, or “Mr. Calleson's classes changed my life”), or anything that.
I became a Whirlwind programmer, first to do optimization calculations for Prof. . assembled to teach the subjects was expected to do meaningful research.