Expose means to uncover or lay something bare, or to discover something in a way that others know what it is. Expository is derived from exposition, which is a noun of expose. An expository essay is a genre of writing which tends to explain, illustrate, clarify, or explicate something in a way that it becomes clear for readers. Therefore, it could be an investigation, evaluation, or even argumentation about an idea for clarification.
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.