Hope you are doing good .

Yes this is a very common problem for droppers who are already enrolled in a course and sit for exam nextanext year and then want to join a different college.

Don't worry. If you have a digital copy of your certificate you can just printed out and the the counselling authority may verify the same. But make sure that you have sent a a email to their official email ID elaborating your problem and conditions.

Please do this. Send a email to their official email ID.

also you can visit the school you passed your 12th from and ask them for a duplicate certificate. They may provide you.

This is a very common problem and you don't need to worry.

please be patient and if you have any more doubts you can ask them in the comment section I would be more than happy to help you.