GATE

When you are in the pre-final year or final year of graduation, you can start preparing for GATE. 6-7 months of dedicated preparation is enough to get a good score in GATE exam.

Hi,
As per the details mentioned on the GATE official website, they have not mentioned whether they do not accept distance learning Bachelor's degree for particular domain, in which you want to apply for GATE exam.
All the best.

It's better to prepare for GATE and secure a seat for M.Tech rather than joining a college which will give you degree but that will be of no use.

Hello Satya,
You can download the GATE 2017 syllabus from the following link:
http://gate.iitr.ernet.in/wp-content/uploads/2016/07/Syllabi_GATE2017.pdf

Yes, you may get calls from PSU and if you don't, then you can apply for the colleges. You can avail the scholarship of Rs.12000 per month.

The core branches like civil, mechanical, electronics, CSE, etc. has better scope.

If you have 3 years of experience then you are eligible for Institute of Engineers, India for M.Tech.

Keep your basic concepts of core subjects clear. Try solving the application based questions. GATE questions level is not very tough and easy to get through if you are sound with your concepts. Practice through writing tests. As the exam is nearing do revise the concepts and take tests.