Hello saksham singh, hope you are doing well.. well, the cut offs does changes every year according to various streams.. also the cut offs are based on various categories .. please refer to the link below to know the ranking exactly.. 

https://www.google.co.in/amp/s/engineering.careers360.com/articles/jee-advanced-cutoff-for-iit-jammu/amp

All the best

Hey Saksham, within the first five rounds the average rank to get into IIT jammu is around 10000 in jee adv