Plz help me !!!

I am a student appearing for IPCC november 2012 both groups.  As this is my first attempt , I, by mistake failed to tick mark the serial number of the questions answered on the cover page ,as per the new format ,of my first paper. I wanted to inquire whether my inability to do so will amount to any negative marking or rejection of my paper.Also if possible , is there any procedure i should follow to correct the same. is it a material mistake
?