Hi aspirant,
CSAB or Central Seat Allocation Board conducts special spot round counselling after JoSAA counselling gets completed to fill the leftover seat in NIT+ system. CSAB allocates college based on Common Rank list (CRL) or All India rank and not category rank. Hope you are clear now.
You can predict your college and branch options based on your rank in JEE Main by using the JEE Main college predictor tool by clicking on the following link: https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer
All the best.
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