I need to write an essay for interview . Can you guide me what should I write ?

What do you mean by "essay for interview"? Interviewers don't want you to read an essay. What, exactly, are you wanting to do?

I need this essay for applying my scholarship interviewing

Then you need to write a good summary of your goals, aspirations and experiences.

Keep it to 2-3 pages at most and make sure to focus on your strengths, goals and experiences.

Your goal is to be convincing that you are the one (or one of the ones) that deserve the scholarship.