Very urgent........!!!!

Hiii friends i am appearing for may 2014 examination ca final.... i am going to give law paper for getting exemption...there is rule of icai that you have to attend all papers in order to get exemption so i will attend all papers in 1st group but if i dont write anything in paper except compulsory requiremnt on first sheet of paper like roll no. etc,can there be any problem??and what if i get zero in 3 papers except law,my exemption will be valid??