Sangeeta madam was made the leader of which group?

Explanation

Sangeeta madam from Kendriya Vidyalaya was made the leader of Group 7 by the director of the adventure course, Brigadier Gyan Singh. She had difficulty communicating with her group members because all were from the north-eastern states of India - Assam, Meghalaya, Mizoram, Manipur and Nagaland, and they did not speak Hindi well. But they grew close to each other while attending and surviving the mountain camp together.