Heyy Jeevan Taraka....

The rank did you got in GATE exam is pretty much good. according to the trends to get into the IIT for a general candidate the rank needs to below 4000 and as you are from OBC category and have attained rank of 3800 you do have a good chances of getting into reputed IIT.

Also you can visit the pillow call affected tools to know your colleges : 

https://engineering.careers360.com/gate-college-predictor