Dear aspirant,

The question asked by you which is of your marks to score under a rank of 1k in jee mains can't be predicted accurately as these things depends on many factors which are subject to change every year like the number of st candidates,toughness of the paper ,your percentile and quality of students that appear on the shift.

You can refer the link given below for a predicted marks-

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