Hello Vijay

To get Under Thousand Rank you have to get 300+ in you Jee mains(Considering General).

To get CSE in IIT Kgp you need to get under 200 rank as last year the closing rank was around 202 for cse.

For more info: https://engineering.careers360.com/articles/jee-main-cutoff

Hello Aspirant

For securing a rank below 1000 in jee mains you should get marks around 330 . And as for securing a seat in IIT Kharagpur in CSE branch the rank is considered of IIT Advanced which depends upon the cutoff for that year . You can get an idea for the same by taking into account previous few years cutoffs.