1. 1. Be familiar with the rules of the competition. What are the requirements (how many words, topic, etc.)
2. Follow the rules of essay writing. Your essay will need a thesis statement, a strong introduction, well-structured body paragraphs, and a solid conclusion.
http://grammar.ccc.commnet.edu/grammar/five_par.htm
3. Know your topic. If you're writing an essay on chocolate addiction, run a Google search and collect some helpful resources. Here are a few:
http://www.wikihow.com/Overcome-a-Chocolate-Addiction
http://psychcentral.com/lib/does-chocolate-addiction-exist/
https://en.wikipedia.org/wiki/Chocolate
http://www.care2.com/greenliving/13-reasons-to-love-chocolate.html
4. Write a rough draft or two before you finalize your essay. This will help you perfect your work.
5. Be sure to submit your essay before the deadline!