Hello Aspirant, 

Don't worry without OBC certificate you can get reservation benefits under OBC quota.

OBC-NCL certificate that is to be uploaded in the NEET UG 2022 application form, should have been issued on or after January 1st 2022 according to the latest guidelines of Government of India. 
In case you fail to upload it (issued on or after January 1st, 2022) at the time of registration then the OBC candidate has to upload a declaration [Declaration in Lieu of OBC-NCL Certificate as per Appendix - XB in Information bulletin] to that effect. 
Visit http://www.ncbc.nic.in for the latest guidelines and updates on the Central List of State-wise OBCs.
****** During counselling process there will be a document verification before admission in any college and during that time you should have your latest and original certificate of OBC-NCL. 

You can also solve the Test series for NEET UG 2022 for better finishing of your preparation, you can get the Test series from the link given below :-
https://learn.careers360.com/test-series-neet-may/


I hope this information helps you.
Good Luck!!