Dear Tejas Gaikwad,

  tejas firstly you have to Clear JEE Mains i.e main exam held in april every year.

you  have clear it .then you can go for the advance round i.e jee advance

Get AIR<=5000 in JEE Advanced, then you’ll get a seat in IIT.

Now i am coming to your second question ...how?

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hope you got your answer .

Good luck :)