Forgot claiming nsc interest in itr

FRIENDS,

I WAS HAVING 7 NSC WHICH I PURCHASED IN THE FINANCIAL YEAR 2011-12, AS I WAS NOT AWARE ABOUT THE PROVISION OF NSC INTEREST , I NEITHER SHOW IT AS INCOME NOR AS DEDUCTION FROM 80-C

BUT WHILE DECLEARING MY INVESTEMENTS TO THE DEPARTMENT I DECLARED MY FULL INTEREST OF 80000 APPROX.  FORM 16 IS STILL PENDING YET.

NOW WHAT CAN BE THE BEST TREATMENT FOR THE NSC INTEREST IN FY 16-17...ALSO I HASNT FILE MY ITR FOR FY 15-16 ALSO....CONSIDERING BOTH THE YEARS..WHAT CAN I DO NOW TO TAKE THE MAXIMUM BENEFIT.