I would quit simply because I would want to break away from the comfort zone of working for my school. If you want your focus to be in mobile app development,

I would quit simply because I would want to break away from the comfort zone of working for my school. If you want your focus to be in mobile app development, take as many contracts as you can until it can replace your work. As a recent graduate you're likely in a lower-risk position to give up a fulltime job anyhow, take the plunge now.. you don't want to wake up in 3 years to realize you're still slicing templates for your school