Hello Manish,
Yes, definitely you can crack IIT and pass 12th with flying clours if you study a bit hard.
It doesn't matter that much as to how you performed in 11th. But try to study a little hard this time.
And for the further details, if you have any query you can even visit our website, where there is a detailed description which would be quite helpful for you https://engineering.careers360.com/colleges/ranking
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