To be honest: I think it was a poor choice for a test. As a band director I would never give one scale as a test to determine chair placement, unless I was doing chair placements on a weekly or near weekly basis. To be a true test everyone needs to play the same thing, and there needs to be something you can really judge you on, one single scale( with everyone playing a different one) is a poor choice. One data point is that, one data point. You need several things to make a meaningful placement. You must also allow for the fact that the person grading you hears differently than you do. What you thought was an "OK" note might have been out of tune, and therefore a mistake.