I wrote answers in space including the left margin in my answer sheet?
The left margin is used for writing question numbers or even mentioning serial numbers like one shown in the picture attached. However, if you have ended up using it, then I dont think you have to worry. The problem arises when you write on the right margin as it specifically mentions not to write in it. I remember using that portion for some answers during my IPCC exams and there were no problem regarding evaluation of my papers. So relax!