Hello,
see jee mains will only ask your category
during the form fill-up. They will not ask
you a hard copy of obc ncl certificate for
scan at that time.

But when you will qualify jee mains and
will appear for jee advance then iit will ask
it during form fill up. And that obc should
be recent of within 6 months .jee advance
will also give you 1 month for submitting
the certificate. Once when you will submit
And then your obc rank of jee Mains will be
valid

Now, if you do not appear for jee advance
then the obc ncl certificate will be asked
from you during josaa counselling session
during reporting and for claim of obc rank
given in jee mains rank card.

So, according to me you should apply for obc
ncl during mid of February and it will be
complete in 4 weeks at most that is March.
Hope it helps

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