Hello!

Analyzing the paper of 25th June shift 1, paper was made with moderate difficulty and based on NCERT pattern.

So, assuming the difficulty level as moderate, you can get approximately 85- 87 percentile if you are scoring 70 in your exam shift. Your exact percentile can be decided based on the students' marks in your shift. Moreover you can go through the previous year MARKS vs PERCENTILE vs RANK data here also: https://engineering.careers360.com/articles/jee-main-marks-vs-percentile

Hope this helps.