Nearly 100,000 San Diego Unified students return to classes Monday, with some major changes awaiting children going back to school, including revised technology policies. Stream San Diego News for free, 24/7, wherever you are with NBC 7. During the month of July, 1,950 new students enrolled in San Diego Unified schools, adding to the 1,083 students who enrolled during June. "Choosing a school is one of the most important decisions a family makes, and we are honored they chose San Diego Unified. San Diego Unified serves 175 schools from preschool through grade 12.