By 7:15 most mornings this spring, 17-year-old Kristian Fletcher has wheeled his dark-gray Acura out of the driveway at his family’s home in Bowie. Over the course of the day, he has reported to a full-time job clear across the capital region in Leesburg, grabbed lunch in the employee lounge, then headed out again to attend senior classes at a prep school in Bethesda.