Hello dear student,

I understand you want to know about the percentile you will get what you are student you have not mention the whole information that is in which exam you are expecting 150 marks because we can calculate the percentile only e when you will give is the name of the exam you are talking about here. And percentile is a relative marking system. Kindly mention the name of the exam so that we can provide you the information. I hope this was understandable

thank you and best wishes