Dear candidate, you definitely need an OBC NCL certificate for jee main. If you belong to the obc category but your family income is more than 8 lakh then you would be considered as general, but if it is less then only you can get a reservation in the OBC ncl category. for jee mains obc ncl certificate from a state or the central government both will work. But for JEE MAINS AND ADVANCE, an OBC NCL caste certificate is required only from the central government. this should be in proper format as described for the exam.

I hope this might be helpful.