Hello,
With this rank in your ST category, you have quite some chances of getting seats in NITs and IIITs. You will be getting some of the lower branches in some NITs and IIITs. You might get some core branches till the last round.
Also, please use the JEE mains college predictor by Careers 360 to get an exact info about which colleges you can get according to your rank.
https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/jee-main-college-predictor&ved=2ahUKEwjyv_bghKTqAhXSZCsKHdOHAMEQtwIwAXoECAQQAQ&usg=AOvVaw1pTMu5LewXe0n3JPiA8V2U

Hope it helps

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