Hello Siddharth,
Considering you as a general category candidate and as you want to take admission in IIT KANPUR for M.Tech in Mechanical Engineering so let me tell you that your all India rank should be under 3k only then you would be able to take admission in IIT Kanpur.
However the cut offs doesn't only depend on the difficulty level of the examination but it also depends on number of seats available in the college, previous year cut offs .
To get knowledge about the cut offs for previous years you can check out the link given below -
https://engineering.careers360.com/articles/gate-cutoff-for-iit-kanpur
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