Hi Deep Ghosh! 

Greetings! 

If you are opting to study in a Core Dept.the priority list is:

1. JGEC
2. KGEC
3. IEM

NOW,

KGEC is in vicinity of a metropolitan city like Kolkata. So,int terms of location it has a bigger advantage than JGEC.

But , JGEC is always reputed to have the best faculties in Core dept. Being a Govt. College,the lab faclities in EE dept. of JGEC are better than any other pvt. college(thats for sure).

Core dept . is always better in any Govt. College than in any pvt. College.

But if you want to grab a job in an IT firm rather than any Power sectors( meant for EE) , IEM has an upper hand than its counterparts.

Thus the choice of preference is upto. you.

Please upvote if this was helpful to you. 

Good Luck.