See if you get a seat on the basis of EWS certificate then if you don't produce the certificate then the admission will be cancelled. Now if you get a seat on the basis of General category then it will be ok but if you want to get a seat under the EWS reservation then you have to produce the ews certificate mandatorily.

For NEET revision tips visit the link below:

https://medicine.careers360.com/articles/revision-strategy-for-neet

I hope this answer helps. All the very best for your future endeavors!