Some Duncanville ISD students also graduate with college degree thanks to district's Collegiate Academy Some Duncanville ISD students also graduate with college degree thanks to district's Collegiate Academy While some districts are struggling to boost pandemic graduation rates, some Duncanville ISD seniors are exceeding expectations by graduating with a high school diploma and a college degree. DUNCANVILLE, Texas - While some districts are struggling to boost pandemic graduation rates, some Duncanville ISD seniors are exceeding expectations by graduating with a high school diploma and a college degree. Not only did these high school students battle through their academics during a pandemic, but they did double duty and completed their first two years of college at the same time.