David attributes Joshua’s success to his high school, the Urban Science Academy, or USA, in West Roxbury. But the good times may not last.

Mayor Marty Walsh’s administration wants to close the school to make way for a new building as part of a $1 billion school modernization plan. School officials say they intend to keep Joshua and 18 other students with autism together at a different high school. That would separate Joshua from the teachers and friends who have made him feel safe.

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