Hello student cut off vary every year on various factors like level of question in examination seats available and total number of applicants in the entrance examination. As you've not mentioned your category, considering you as a general category student you need to secure rank around 180 to get in top notch branch like CSE

For more details refer to the link mentioned below - https://www.google.com/amp/s/engineering.careers360.com/articles/jee-advanced-cutoff-for-iit-madras/amp

Feel free to comment if you've any doubt

Good luck