CLARENCE — Madison Koch, at age 24, has a bit of a dream job with the Minnesota Vikings. Koch, a graduate of North Cedar High School in Clarence, about 35 miles east of Cedar Rapids, recently visited her alma mater to tell students there about the “unique benefits” they have attending a high school with about 250 students. For one thing, you’re able to be involved in a variety of activities, she said, adding that involvement helped her career. “I could tell those kids are in that same situation that I was, when I didn’t realize this (school) was special,” Koch said.