dotNET

I think Java and networking have better scope in future.
1) For many years Java language is providing the best technology solution to the industry and also it is the most secured platform.
Also, you can see that Java is the core technology for android. Android also has a good scope in the current scenario.
2) Networking is one of the best fields because we have to do something new to get better and secure mode of communication. Also, after CCNA, you can clear CCDA.

If you are planning to be an application developer, you must do courses on both Oracle and .NET.

Yes . Computer Science can be learned by anyone and certifications are available for even a kid.

.NET alone is not going to work. Stll you can expect a min of 30 K per month

Yes, you can pursue .NET or Java. It's a great language to learn. You can get a job after completing the course.

Hello Aman Sharma,
As you have shown interest in automobiles. To become a part of the stream, you need to pursue engineering degree / Diploma first with a strong base in science and mathematics, then you can go for ME/M.Tech in automobile engineering.
You may even opt for short / long term courses comprising of different levels such as designing, development or manufacturing with automotive. It depends on you where do you want to fit in.
I hope it helps.

It's okay. My friend got in universities with GRE score of 284. So, there's no problem. But, as you are working, you should write again to get scholarships if your academics are good.

C-DAC is the best.

For .net training, only two names are there in training organization, one is Mr. Anil Singh and other is Mr. Rajpal, bond in the training industries and both are working with CETPA Infotech Pvt. Ltd. They are having very good trainers in their Roorkee, Noida and Lcuknow branches. So I will suggest CETPA and after that you may go for Vector Institute.