Hello Nayak

Congratulations for your result.

So according to last year's cut off sorry you have no chances to secure a seat in IIT's.

Usually ST category cutoff for iit's goes below 800 rank and for top iit's it goes below 200.

You can check out last year's Jee Advance IIT's cut off using this link:

https://engineering.careers360.com/articles/jee-advanced-cutoff

Also you can predict your College using this link:

https://engineering.careers360.com/articles/jee-advanced-college-predictor

So I hope you find this helpful 

Thank you 

Good luck.