don't worry it's not a big mistake. you might have been in a hurry or you might have over looked the same. your paper will be definitely evaluated. at last a qualified CA shall evaluate a paper who might have already faced all the hardships as a student
Hey, That was made as a rule to just ensure neat presentation I guess... as long as you have mentioned question numbers clearly for every answer, I dont think you have a problem. But as others have said just ensure that you follow it in the next paper.