Principal Michael Gill is “graduating” with Cohasset Middle/High School’s class of 2012. Gill, who has been working in the district for 32 years, is retiring at the end of June. “It’s not going to be easy,” Gill said of leaving. “I’m going to miss the kids.” Ninety-five seniors graduated earlier this month, with most going on to higher education, he said. Gill, 58, will move on to become principal of Sacred Heart High School, a coed Catholic school in Kingston.