Hello Aspirant,

It would be difficult to tell you the exact about the qualify marks & admission possibilities as JEE Main is being conducted twice by NTA for the first time. Based on this score your probable rank will be 53,024 - 60,524 and your probable percentile will be 94.1 to 96.1. 

NOTE: The Overall Rank Predicted is on the basis of the expected total number of students i.e. 1152650 appearing in the JEE Mains 2019.

Based on this score the chances seems less to get the core branches in NITs IIITs, You can also check your other admission possibilities with JEE Main college Predictor tool.

https://engineering.careers360.com/jee-main-college-predictor

Good Luck!