Electronics and Communication Engineering

Both are having good scope. The best is the ECE. In ECE, you can apply in telecom industries also. After ECE, you can also apply in the electronics departments in various organizations and companies.

It depends on colleges, total aggregate, no of companies visit, no of students applied, total internships and any research paper published and many others factors.
The average salary is about 3-4 LPA.

Hello Deepika, MBA can be done in various specialisations like MBA in marketing, Finance, International Trade, etc. Do a in depth research about details of each type and decide what you really want to do. Read from the following link-
https://www.shiksha.com/mba-chp1
I hope this helps.
All the best.

ECE is about electronics and how the different electrical components (Microprocessor, RAM etc) communicate with each other. It has more Physics in it. There is a little programming involved but not much.
CSE deals with telling these components what to do and when to do it; by programming them. It has a lot of logic involved and Maths too.
Both are inter-dependent. Placement wise, ECE is a little better than CSE as it has more offers in the public sector (govt jobs). Also ECE is considered to be somewhat of a "evergreen" branch.

You need to apply to the universities/colleges of your choice, by yourself. Some universities in Germany accept the GATE score too.

No, it's not possible. Try for other NITs. To know the opening and closing ranks of JEE Mains, follow the link josaa.nic.in

Kindly use the college predictor app. I hope this will resolve your query:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor