It depends on which course you want to pursue in iit and also on which iit you want to choose.Basically there are four main courses, machine design, thermal, production and industrial. Generally priority of most of the students are 1st design, 2nd thermal than any of the remaining two.
Hi Israr,
You can check the list of college/institute with the help of predictor https://engineering.careers360.com/articles/gate-college-predictor.
All the best!!
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