With a score of 70 in JEE Mains and EWS reservation, you can expect a percentile range of around 77.4 to 78.2. This would place your rank between approximately 2,62,000 and 2,66,000. While this rank may not be competitive enough for top NITs like NIT Trichy, you could still have a chance at some of the newer or lower-ranked NITs depending on their cutoff trends.

For more details you can visit the link given below:

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