Hi,

According to previous years, then based on the percentile mentioned by you in the question your rank is expected to be 3.6 Lakhs. You can check out marks Vs ranks Vs Percentile from the link given below :-

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

If we go through the 2020 cut-offs, then it shows that you have quite less chances to get any of the NIT even after having SC reservation. Now to secure seat in any NIT you should have your JEE-Main 2021 score at least 120 marks out of 300 and percentile against this is expected to be in the range of 92-95. Lastly, it is very tough for you to get a NIT seat. Look for GFTIs, there could be some chance for you.