Essays / Essay for entry into Nursing Program [2]

Hello everyone.

I am new to the forum and, I have decided to go back to school after 20 years. Tomorrow I must write a 500 - 750 word essay on a topic which has not been disclosed. Can someone please give me an idea on the basic principals of writing an essay? Do I write subjectively?

Do I just reword what I see? I would like to be somewhat prepared for the unknown if possible...

Cheers.