Ok. Here goes:
The Ranks lists are 8 in total - GEN, GEN-PwD, OBC-NCL, OBC-NCL-PwD, SC, SC-PwD, ST or STPwD. So all candidates will be assigned an All India rank based on their performance in the exam. Candidates who belong to the reserved category will be ranked in the reserved list say for example an OBC NCL candidate will be given the All India Rank and will be in the OBC NCL rank list as per his/her performance in the JEE Main in comparison with other OBC NCL candidates who have appeared in the exam.