Charts don’t have the same scale. As the result, it’s hard to visually compare these - for example, for juniors, the shapes are similar for score 4, but top tie

Charts don’t have the same scale. As the result, it’s hard to visually compare these - for example, for juniors, the shapes are similar for score 4, but top tier school students are above 20 mark, while the rest are below. Interviewing is expensive, especially if you hire the wrong person, and if a given population tends to cluster around higher scores, that what you’d pick first.