Hey,
The number of candidates appearing in the examination changes every year,so it's not possible to make a clear prediction.
As per the given data,this year 869010 candidates appeared in January session. The percentage of various categories are:OBC-NCL(27%),SC (15 %),ST(7.5%) and open category(50.5 %).Within each of thess categories 5 percent horizontal reservation is provided to pwd students.
You can follow the link given below for detailed information about JEE Mains Reservation category:
https://engineering.careers360.com/articles/jee-main-reservation-criteria
Hope this helps.
Good luck.

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