Converting nullity petition into mcd.

Hello Friends,
  
             Is it possible to Convert my nullity petition filed under section 12 A and C into MCD under 13B after completion of one year of my marriage in first week of May 2014.

             I filed petition for nullity of marriage within 4 months of my marriage and now hearing is going on from 6 months in family court.
             I am unable to prove impotency of my spouse and fraud marriage.
       
             My marriage will be completing one year in 1st week of May 2014.
            
             So after first week of May 2014 instead of withdrawing my nullity of marriage petition
and filing fresh MCD, can I convert my nullity petition filed under section 12 A and C into MCD under 13B.
    
       Please Note : My wife is ready for MCD but judge is not allowing our request for MCD under
section 12 A and C. Judge wants me to prove impotency of my spouse which is difficult task for me.

Thanks