Dear student,

If your CRL rank is 10000, then your obc category rank will be around 2000 or somewhat near than 1900.
But fot securing rank under 10000 crl rank your percentile will be above 99.2 percentile.
And for that you must have to work very hard.

Also check out the following link to know more about jee mains :-
https://engineering.careers360.com/exams/jee-main