I have got 51 marks in St category what are the chances in IIT admission

Hey Satish!

An SC or ST student needs to get minimum 50 marks in JEE ADVANCED to secure a seat in IIT. Since , you have scored 51 marks , you have chances to get into IIT. But you can not get into the top IITs like Roorkee , Kharagpur , bombay etc. But i can not tell you exactly the names of IITs where you can get , as i do not know your rank and your preferred branch.

So either mention it in comments or go through the following link to predict your colleges usung JEE ADVANCED College predictor tool 2019 :

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

Hope it helps!