If we analyze JEE Main 2020 Ranks vs Percentile data, if your CRL Rank is 3,17,000, then your ST Category Rank is expected to be in the range of 6,000 - 7,500 .

The rank written above is predicted on the basis of the previous year's data so your actual rank may vary depending upon current factors.

You can use the following link to predict your score :

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

Good Luck!