Sister School Tumbuh High School Yogyakarta dan SDN Petoyan II Giritirto, Purwosari, Gunung Kidul.

Dalam program “sister school” antara Tumbuh High School Jogjakarta dan SDN Petoyan II Giritirto, Purwosari, Gunung Kidul” kegiatan yang dilakukan oleh siswa THS di SDN Petoyan II Giritirto, Purwosari, Gunung Kidul  yaitu making positive quotes, arranging books in library, reading corner, drawing corner, gardening, sharing among parents about inclusive school & learning proceess of children.