M.S in India

IITs and NITs are the best institutes for doing M.Tech or MS in India. Admission in M.Tech st IITs and NITs is based on GATE score.

Hello Rithick,
It depends on you. If you have good marks in graduation, you can go abroad for higher education, else you can choose India as there are lots of institutes, which provide excellent education.

First, you decide where you are going to study and then ask questions. I am only answering about study abroad.
First, you decide which country you wanted opt for higher studies based on the factors like cost, duration, part-time job earnings and the post study work visa or stay back options. You need minimum 60% marks and to prove your English language efficiency you need to take IELTS or PTE exams. Once you fulfill the eligibility criteria, you can apply online or get the assistance of an education counselor.

IIT, Roorkee is the best institute for M.Tech in civil engineering. You may evaluate the same to fulfill your academic requirement.

You haven't done MBBS or BDS. So you aren't eligible for appearing MD MS examination. As you have done B.Sc, you can go for M.Sc.
All the best. Feel free to revert.

Hello Nimi, India too has good institutes for aerospace engineering. If you are planning to study abroad Germany is the top destination besides Singapore, UK and USA.
Regards