Hey mouli !

CSAB special round is conducted to fill the seats in NITs IITs and GFTIs left vacant after the initial rounds. Since the competition for these reputed institutes is so high , that one can expect all the seats to get filled in special round , as there are many students who apply for CSAB special round , but only a few seats are left vacant or are available.so ,all the seats get filled after special round of CSAB and no seat is left vacant.

Tk know more about CSAB special round , follow the given link:.

https://engineering.careers360.com/articles/csab-special-round-for-nits-iiits-and-gftis

Hope it helps!