Yes, by scoring 200 marks on an average difficulty question paper, you can get around 99 percentile easily. But if the difficulty level of the question paper fluctuates highly, i.e., either too easy or too hard, then the percentile will change accordingly. If the difficulty level is too easy, then by scoring 200 marks you may not even get a percentile of 95.

You can be sure enough that scoring around 200 on an average difficulty question paper will fetch you a percentile of 99 and above.

Hope it helps.