Hi

It's quite difficult to predict marks required  to get 99 percentile as percentile score for the same marks  keeps changing every year depending upon various factors like number of students that appeared in the exam, kind of marks obtained by them , toughness level of the examination etc.

But if we look at previous year trends, then last year in JEE Mains 2019 , 99.06 percentile corresponded to 177 marks, but last year JEE mains was a 360 marks and from this year it is of 300 marks, when we convert the score of 177 marks out of 360 into the score  out of 300 marks it comes out

(177/ 360 * 300 )

= 147 marks

Hence, to get 99 percentile you should try to get at least 147  marks in jee mains 2020

For more details check out our page at

https://engineering.careers360.com/articles/jee-main-marks-vs-percentile

Thank you