Hello,
The Central Seat Allocation Board (CSAB) special round is for admission of all JEE Main 2019 qualified candidates in left over seats of NITs,IIITs and SFTIs after the initial rounds of counselling.
No, the seat allotment in CSAB will be done on category basis only. So rest assured and be updated with the counselling dates etc.
Follow this link for more
https://www.google.com/amp/s/engineering.careers360.com/articles/csab-special-round-for-nits-iiits-and-gftis/amp
Good luck

Yes rahil i also have heard that from this year the admission are given on the basis of your nimcet general air rank  . Your category doesn't matter . If you have good rank means under 500 or 600 in general category then you might have possibility to get into the college.