What are the chances of getting a core branch at nit surathkal home state with ews rank of 2440

Hello Akash
As you know that the ews category is included first time in jee mains and we don't have enough information about the last year cut offs and other information .
But you may get Mechanical engineering and electrical & electronic engineering ; or som other branch also depending upon the popularity and the choices and preferences if other students.
So fill your choices very wisely and carefully because nearly 30 % Admission will be depend upon your filling of choices.
For reference you can last year cut offs for Gena and other categories and have an idea about it :
https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-cutoff-for-nit-surathkal
Goodluck.