Dear Veerendra
Every group is having it's more importance. I'm from mechanical,  we have some opportunities in core sector and civil also have only some. But when compared to mechanical and civil, CSE is having lot more opportunities and you can't even predict...
If you've enough knowledge that you can go and crack core then mechanical /civil is good otherwise go with CSE
ALL THE BEST.

The core sector is best.
You can go for the electrical.. Mechanical... Electronics.. Civil.. Information technology as per your own choice