Counselling
For the reserved categories, there are two lists of castes - one issued by the State govt and the other issued by the Central govt.
In many cases, there are castes that are recognized as OBC by the relevant State govt but not by the Central govt. Thus, such castes
you just have to download a pdf from the below site which says OBC-NCL Certificate Format
https://jeeadv.ac.in/downloads.html and just go to the last page
you will find your answer
You can choose branch according to your choice and interest. All the branches includes mathematics. To check which colleges and courses you can get based on your rank you can use below college predictor JEE Main College Predictor
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JEE Advance
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