Metallurgy

Hello Mohd,
You have to select that subject in GATE in which you want to do your PG.

There are so many top college in India which are renowned for their metallurgy departments. It depends in which state Do you want to study. It's always better to study from a renowned institution in such fields.

Metallurgical engineers are employed in every industry and enterprise that produces, buys, sells refines or manufactures metals or metallic products. You have probably heard many times that modern societies cannot function without a plentiful supply of every conceivable type of metal and alloy and that people who are skilled in the use or production of metals and metallic materials of all kinds are highly valued.
Try abroad for better salaries.

Metallurgy is a very niche engineering branch and one don't get a very high starting package. So, after completing metallurgy from IIT Bombay, you can expect a package of 4.5 to 6 lakhs per annum.

You have sufficient educational qualifications to apply for jobs on PSU, Government and Private sector.

I think you should consider your interest in the specific branch of engineering rather than considering the college preference. Both branches, metallurgy and civil are quite vast and entirely different. So please first consider what is your interest in that specific career option.