back date articleship

mai ye janna chahta hu ki jaise 16th Nov 2018 ko ipcc 2nd grp k exam dene k baad mai apni articleship 18th Nov ko start karunga but mai chahta hu ki meri articleship starting ki date 31 oct se pehle ho (back date articleship) taki mera final ka attempt May 21 pade na ki Nov 21 (I.e six months delay of final exams)to iske liye kya procedure hoga aur kya stamp paper pr mere aur mere principal ka agreement bhi hoga kya... plz suggest me