Here are two context clues worksheets on the adjective mediocre and the noun mediocrity. I probably shouldn’t own up to this, but I wrote these so my students in Manhattan would have words to describe their experience as students in the New York City Department of Education.
If you find typos in these documents, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.