hii somnath

there are lot many factors that would decide the rank category,Date of exam, marks,exam slot so kindly refer the below link to try it

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

but you have scored good marks., .For IITs, your GATE score is near about to 800.

Here is the cut off trends of previous year for IITs 

Https://www.google.com/amp/s/engineering.careers360.com/articles/gate-cutoff-for-ce/amp

I would also like to recommend try for college predictor

Https://engineering.careers360.com/gate-score-predictor

regards