Electronics and Communication Engineering

https://www.shiksha.com/b-tech/resources/kcet-college-predictor
Use the college predictor link. Good luck.

In India, R&D is always on the lower side. And hence, we almost never see anything great happening in the field of electronics (or for that matter, Technology). And hence most of the electronics graduates waste their time doing something else. If you seriously want to do something worth, please look beyond India. And, as soon as you finish your B.Tech, get into MS + Ph.D. courses. And, chances are very high that you will end up doing something meaningful in electronics.

Yes, it is good. It depends upon your performance and skills.

Choices will be filled in the last week of June may be or it can go to the first week of July.
Good luck.

In my college, I came across the following subjects in ECE 1st year:
1) Engineering Mathematics-1,
2) Physics
3) Chemistry
4) Engineering Drawing
5) Basic Electronics Engineering
6) Basic Electrical Engineering
7) Electromagnetic Field Theory
8) Communication Skills
9) Environmental Studies.

Firstly, minimum of 50% marks in 10+2 is required, and then a good rank in the entrance exam is necessary. Exact rank range in entrance exam depends on which college you are talking about. Make sure you are keenly interested in the subject and take an overview of the course curriculum and talk to alumni what the major contents are all about. If you can relate to it, then take it up. Job opportunities and higher studies career path both are great for ECE.