HCG is a CCC in Ahmedabad - Private institute but has some decent reputation.

All the best for treatment, RT is going to be terrible! Erbitux is an option but it will be an expensive one in India. Rather than RT, Proton Beam Therapy may be more effective in this setting, discuss with oncologist and locate a center (I do not think we have one in India yet) where your brother can have it done.