PleaseLetMeInYourProgram

So I am trying to get a masters in clinical mental health counseling, and I got an interview. Hooray! Then I saw what it entails. They listed "writing assessment" as part of my in person interview. My concern is what am I writing, and how are they assessing it? Has anyone experienced something like this? If so, what did you have to write? Sincerely, Not so great at writing