For GIiS scholarship  students nees to have minimum percentage in 9th and 10th grade as er their boards shared below. 

Aftwr which they get shortlisted and have to appear written test. Students who qualify this will need to give skype interview and FacetoFace Interview. 

After which final selection list is released  

Entire process explained below  . 

http://www.giisscholarships.org/scholarships/