Hello student predicting exact details is little difficult as it vary every year on various factors like the level of question in the entrance examination and total number of applicants in that examination. But our Experts prepare a chart for Jee applicants in according to that you need to score around 178to187 marks if you want to secure 99 percentile.
Application for jee main April examination starts from 07th of February and extended till 12th of March 2020.
For more updates refer to the link mentioned below
https://engineering.careers360.com/articles/jee-main-marks-vs-percentile/amp

Feel free to comment if you have any doubt
Good luck

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