Talk to your high school counselor or your college adviser. They can give you some essay examples and you can have them proofread your essay once you are done writing it these professionals will have insight into what the admissions officers are looking for in an essay. And it is always a good idea to have one or two people read over your finished essay in order to make sure there are no grammatical errors.
As any writer will know they are not the best person to look for any errors or omissions in their work. Read it through certainly pick up some obvious mistakes of course. However being too close to your writing is one of the reasons that book editors exist and of course the same applies to essay writing.
Use the internet to find various sites that will help you in writing your essay. They provide essay examples along with tips to help you design your scholarship essay outline. Having an outline can make the writing portion of the essay go a lot smoother. And you will be able to write a better essay which will increase your odds of winning the scholarship you are applying for.