WBJEE

Yes, at this rank, you are eligible for Kalyani Engineering College for mechanical engineering and also for electrical, information technology With TFW, electronics & communication engineering/electronics & telecommunication engineering with TFW.

You have good rank with this rank. You can get Jadavpur University for CSE. Simply lock this option at time of counseling and after allotment, visit college and get admission.

No it's not necessary. It is just for the reservation purpose only.

No, with this rank you can't get Government College, but I am listing some colleges, do check the list below:
Hooghly Engineering & Technology College
Netaji Subhas Engineering College
Brainware Group of Institutions-Savita Devi Education Trust
Dr. B. C. Roy Engineering College
Guru Nanak Institute Of Technology
Techno India-Banipur.

I am listing some top colleges do check the list below:
Netaji Subhash Chandra Bose Institute of Pharmacy
BCDA College of Pharmacy & Technology
Bharat Technology
School Of Pharmacy, Techno India University
Calcutta Institute of Pharmaceutical Tech. & Allied Health Sciences
Dr. B. C. Roy College of Pharmacy and Allied Health Sciences
Bengal College of Pharmaceutical Science & Research.

You'll get all branches like:
Computer Science & Engineering/Computer Science & Technology
Electronics & Communication Engineering/Electronics & Telecommunication Engineering
Electrical Engineering
Information Technology
Mechanical Engineering
Instrumentation Engineering/Instrumentation & Electronics Engineering
Civil Engineering
Chemical Engineering
Power Engineering/Power Plant Engineering
Metallurgical Engineering.

Yes, you can get E&TC on the basis of your OBC rank, and also you can get:
Computer Science & Engineering/Computer Science & Technology
Electronics & Communication Engineering/Electronics & Telecommunication Engineering
Information Technology
Electrical Engineering
Mechanical Engineering
Instrumentation Engineering/Instrumentation & Electronics Engineering
Civil Engineering
Chemical Engineering.

OBC rank is just for the reservation purpose.

You don't have to apply somewhere. Just go there and get the mock counselling done by experts.

Mock counselling of WBJEE is that system in which you are able to get a rough picture of what colleges you will get. It's purpose is to analyze the candidate about what seat he may get. No, it is not necessary to attend. One tip from my side will be to attend this as you will get a clear idea.