GATE

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.

Agricultural sectors does not hire through GATE. If you have good score in GATE, then you can opt for higher studies in a good college.

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.

Yes, BITS organize different exam for ME or M.Tech. You can also take direct admission in some private institutions for ME or M.Tech.

no u can also proceed without gate.