Can I store my gun in vehicle at school parking lot? (michigan)

Hello, I go to a school in Michigan that isn't University of Michigan, Wayne State University or Michigan State University.I own my CPL in michigan, and wanted to know the rules for leaving a gun in my vehicle while in class.According to this website, it looks legal. Though a teacher is telling me it's not. Any thoughts? http://ift.tt/1T7j1eK via /r/CCW http://ift.tt/1Wufr1h