Hello Ganesh
Actually there's no fixed percentage of marks which is required to get into an IIT
You are an OBC candidate so you must try to get a rank under 12,000-13,000 to have a chance of getting into an IIT
The marks depends on the difficulty level of the paper which changes every year.
If the paper is easy the GEN cutoff to get a rank is 35% else it's below that. So you should practice accordingly.
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