Hello,
Your question seems to be incomplete since you have not mentioned the name of the exam and hence a bit confusing and because of this we are not able to answer your question properly. If in any case you are asking about JEE Mains then you will have to score 178+ to get 99 percentile. This is based on the previous years analysis.
If you wanted to ask about some other exam then kindly ask your question giving more details so that we may be able to help you out better.
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Good luck
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