Hello

It's okay if you  completed your 12th in 2015 and could not complete your degree you can anytime start a fresh with a new admission. Just don't loose hope, and keep going. Your eligibility depends upon the college you choose because every college has it's own  eligibility criteria for admissions, some colleges do allow and some don't.  For exact details you can check the official website or directly contact the college you are seeking admission in and confirm their eligibility criteria. However, if you have your 12th class certificates you can get admission.

All the very best for your new journey.

Hope this answer helps.