This is not rewriting or editing but adding to the existing essay to make it to meet minimum 1000 words requirement. One page worth of writing to either add to the end of the essay or to weave into the existing content will be sufficient. Please be specific where to add-in if extending existing paragraphs.
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.