
At some
technical writing interviews you will be required to pass a test, the length and difficulty of which depend on the employer. If you are given an editing test of just a short paragraph, assume that the person interviewing you is the person who wrote it.
Thus, if the paragraph is badly written, do not say so. Correct it as well as you can and be prepared to justify why you made those changes. In this situation, it helps if you know the rules of grammar because you can use them to minimize the sting of your corrections. Thus,