Except that's not true. Zoey was a great student in high school, except when the show wanted to shove Rainbow into scenes with her, then the writing became really inconsistent.
And the fashion industry, especially on a macro level, is not some shallow pursuit. It involves a complex knowledge of history, trends, cultural traditions, commerce, business management, etc. become a major success.
Look no further than fashion superstars like Andre Leon Talley, Diana Vreeland, Karl Lagerfeld, Vivienne Westwood, Jason Wu, Donna Karan, Christian Louboutin, Vera Wang, Gianni Versace, Willi Smith, etc.
Not really. Junior, like Zoey has been portrayed as a good student in high school, but is regularly clueless when it comes to interacting with most of his peers socially.
If a good student like Zoey turned into a party animal, unintentionally, during her first year of college, then unfailingly naive Junior wouldn't stand a chance IMO.