For this essay, you will select one of the sources you have found through your preliminary research about your research topic. Which source you choose is up to you; however, it should be substantial enough that you will be able to talk about it at length, and intricate enough that it will keep you (and your reader) interested.
All applicants go through a series of tests that check their level of English and knowledge of formatting styles. The applicant is also required to present a sample of writing to the Evaluation Department. If you wish to find out more about the procedure, check out the whole process.