Hello Deepak!!
To get admission In IIT madras ,a candidate needs to appear for the jee mains examination conducted in April month and also need to get top score in the exam. Mains is the only entrance exam to get admission in top IITs and NITS. For more details about this college just go through the link provided below:

https://www.careers360.com/university/indian-institute-of-technology-madras/amp
Hope that helped you a little bit. Good luck!!

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