IITs are one of the most prestigious Institutes. 

Joint Entrance Examination Advanced (JEE Advanced) is a national level engineering entrance exam conducted by seven zonal Indian Institutes of Technology (IITs) under the guidance of Joint Admission Board (JAB) every year, for admissions to 23 Indian Institutes of Technology (IITs).

In order to be eligible for JEE Advanced you have to qualify JEE Main exam first.

You can check the eligibility criteria of JEE Advanced from the given below link

JEE Advanced Eligibility Criteria

To check the cut off you can refer below link

JEE Advanced Cut off 

Good Luck!!