Hello applicant,

*CSAB counseling is basically for filling the vacant seats in NIT's, IIT's, GFT's, etc.., after the JOSAA all rounds counselling is finished.
The first criteria for participating in CSAB counselling is - you must have given JEE mains 2020.
*And the second and the important criteria for participating is that - you must not accept the seat in josaa counselling, that means, if you got alloted a seat in any round of josaa counseling, then you have to withdraw your seat.

*Now the concept is simple - if you withdraw your seat from josaa counseling, then automatically it is understood that your josaa alloted seat is no more with you as your seat is canceled.

* Even if you do not get any seat in CSAB counseling, then also you cannot do anything as your josaa seat is gone and you cannot take admission, in your alloted college.

*Click on the following link to know more about CSAB counseling :-
https://engineering.careers360.com/articles/csab/amp

Hope it helpful