It would be difficult to tell you the marks on the basis of your JEE Main percentile. The final answer key has been released in which there are total 22 wrong questions in JEE Main 2019. These questions have been dropped and full marks have been given to the candidates. You can check the further information with the given below link, It can help you to give an Idea about your marks.

https://engineering.careers360.com/articles/jee-main-answer-key

Based on this score your probable rank will be 270,427 - 300,427, The chances are less to qualify the exam. I would suggest you to appear for the exam again.

NOTE: Rank Predicted is on the basis of the expected total number of students i.e. 1152650 appearing in the JEE Mains April Session.

Good Luck!