Hi

Yes to participate in CSAB counselling JEE main score is enough. Please check the other eligibility criteria for CSAB in the below link. There are 3 different channels in CSAB counselling naming CSAB NEUT( North-Eastern states and Union Territories), CSAB UT (supernumerary seats in the Union Territories), and CSAB SFTI (Self-financed technical institutes). Josaa counselling allots seats to NITs and IITs. The rest of the vacant seats in NITs ,and the seats in IIITs and GFTIs are filled in CSAB round.

For more details

https://engineering.careers360.com/articles/csab

To know your admission chances in JOSSA counseling & State counseling, You can use JEE Main college Predictor tool

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

Hope this helps.