Hi Shereena

Yes, if you want to apply in KEAM, you will have to produce the category certificate. You have to make sure that your OBC certificate is valid as per Kerala government. 

If you are filling KEAM application form, you will have to submit your category certificate with it.

Check all the details pertaining to KEAM application form from the link given below :

https://engineering.careers360.com/articles/keam-application-form

All the best !