A college requires additional documentation in the form of a 12th passing certificate. You can directly contact the college, seek provisional admission, or take a year off while dealing with the issue.
These are some of the potential approaches:

Reach out to the College Admissions Office:
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Discuss your problem: Tell them the truth of the matter by stating that you currently do not hold a 12th certificate pass.
Ask for options: Check if they can provide provisional admissions based on predicted marks or your previous academic achievements.
Check for entrance examinations: You might be able to get admission to some colleges with entrance examination results.
Seek out Provisional Admission:
There are many colleges who are willing to give you provisional admissions based on exceptional predicted scores or previous accomplishments.
Ask them if provisional admission is a possibility and if so, what are the conditions attached to it.
Think about taking a Year Gap:
If it’s impossible to gain admission in the immediacy, one option is to take a gap year where you can work, volunteer, or go traveling.
American Gap Year isn’t just a travel break; it is a creative period that wants you to challenge yourself academically and hone your skills.
Investigate Other Educational Alternatives:
The National Institute of Open Schooling (NIOS): NIOS has several courses where learners can enhance their knowledge and educational credentials for further learning.
Other Boards/Universities: There are other boards or universities where you can get similar course offerings.