Hello!Runal

Your gate score isn't enough to secure seats in IIT Madras.You need at least 700 for IIT Madras.You can apply for newly IITs such as IIT dhanbad,IIT Mandi etc..To know which colleges you may get visit below mention link:

https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/gate-college-predictor&ved=2ahUKEwispL6g2JThAhXX6nMBHZmSCiIQjBAwA3oECAcQDQ&usg=AOvVaw1xiFTORDwDEpBZmadY5ZwG.

GOOD LUCK!