dear aspirant,

eligibilty to appear in CSAB are as follows:

• All the candidates need to have a valid JEE Main 2019 rank and also meet JoSAA eligibility criteria 2019
• Those candidates who have not participated or registered in JoSAA 2019 will also be eligible to apply for the special round
• Candidates who failed to get a seat in JoSAA 2019 after participation will be eligible to apply CSAB 2019 special round
• Candidates who got seats in JoSAA 2019 but failed to report at the allotted institute or withdrawn their participation from counselling will be eligible to apply in CSAB special round 2019
• For candidates who opted not to participate in Special Round after JoSAA will not be eligible to participate in CSAB special round 2019

All fresh candidates including candidates after JoSAA 2019 who did not pay the seat acceptance fees rs .36,500 for general/obc and 16,500-sc/st.

hope it helped.