Those that had come to participate in the assessment weren't only enchanting apprentices. There was also a portion of primary level enchanters that wanted to improve to intermediate level enchanters. As for some intermediate level enchanters that wanted to rise to high level enchanters, they wouldn't take their tests here and would use a specially prepared chamber arrangement; after all, an intermediate level enchanter's identity wasn't considered as low.
Your gift is the motivation for my creation. Give me more motivation!