As far as I know The Manchester School of Technology is a open to students who are enrolled at one of the local high schools (Manchester High Schools (Central, West & Memorial) as well as Goffstown High, Londonderry High, Pinkerton (Derry's HS) and Bedford High).
I don't believe they run a full-time program, but I would suggest getting in touch with Karen White, who is the director of the program/school. Her email is email@example.com or you can call: 603- 624-6490
All the best!!