You need to appear JEE Main Entrance Exam, After Qualify it you need to apply for JEE Advance thereafter AAT entrance exam conducted by IITs you need to apply.

Good Luck!

For Architecture courses, JEE MAIN holds a different paper alongside the normal one. In that paper there is drawing test based on one and paper.

Advancing into JEE ADVANCED will allow you to compete for a seat in IITs

https://engineering.careers360.com/exams/jee-main

Follow the link above to get all queries solved about the exam.

Thanks