Hello Abhi,

Admission to Engineering course in IITs is on the basis of JEE Advanced exam. And, to appear for JEE Advanced exam you will have to qualify the JEE Main exam.
You can register for the JEE Main 2019 January exam till September 30.
Go through the link below for detailed information-

 https://engineering.careers360.com/articles/jee-main-2019

Good Luck!

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