How long is a short essay suposed to be?

I need essay help!!!?

Next week I have an important ELA test where I will have two and a half hours to write a business letter and an essay. The business letter topic and the essay topic will not be revealed until test day. I'm not worried about writing the business letter, however i'm incredibly scared about the essay. In first term ELA, I averaged a 97. In the second term of ELA, I averaged an 100. However, this term I got 69% on an essay that I wrote. Later on, I got 87% on an essay I wrote in Social Studies. Last week, my ELA teacher gave the class a practice essay and business letter to do. We had exactly 2 1/2 hours to do it. However, after the business letter i completely froze. I didn't know what to write and what to do. I had to stay after school on Friday to finish it. How can I prevent this from happening, and how can I write a great essay. Please don't refer me to a link.
Answer:

Whom can I ask?

The Ruud Boy at Yahoo! Answers Visit the source

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