Hello Sir, I am fine , hope you are doing well .

You can get into IIT  by these steps

1.Get more than 75% in 12 th science

2.Study and score well rank in JEE mains ,a score of more than 70 percent is acceptable

3.you must qualify for JEE Advance by giving JEE Mains and get in top 2000 rank in JEE Advance.

You need to study hard because there are 10 lakh students who appear for it.

You need to study from your 11 th std for JEE Mains and Advance.

Practice enough by reading NCERT and other reference books and crack the exam.

Hope I made myself clear .

Thank you

To get a seat in IIT , you must 75% marks in your 12th boards and you must qualify JEE mains and JEE advanced with a good rank.

You can go through the article for guidance https://engineering.careers360.com/articles/how-get-b-tech-admission-in-iit-bombay