Hi Sagar,
I am Anshuman, I am a CA Final old course student. God forbids if any one fails in CA Final old course...get registered in CA Final new course. It will take Rs 1100 for reregistration from old to new course. Just download Form 103 from ICAI.org, tick option Conversion on top of the form, fill it, send along with DD of Rs 1100, to ICAI address will be mentioned on the form. this is for your information, hope you don't have to use it...hope you get pass in old course...best of luck brother