See if you aren't able to submit your marks in any examination/counselling then don't worry its expected that the organizers will consider the problem and can open portals as there can be many students of 2nd PUC who became in eligible for the counselling. But to be sure you should contact the organizers of the examination. As you didn't mentioned the name of the counselling or examination, its not possible for us to provide the contact details but you can get the contact details from the official website of the organizers.

I hope this helps.