Yeah, NCST is the indian registrar for all .in TLDs... You have to submit a registration certificate if you wanna register a .co.in or a .org.in domain...
We have to register our ilug-bom.org.in domain every year and i know how hardships one has to go through at NCST's office... all the formalities and RedTape makes one crazy... I'd strongly recommend you to register a .org domain if its for your personal needs...