Civil Engineering

You can opt for building technology, environmental engineering, geotechnical engineering or water resource engineering.

B.Tech through lateral entry (direct second entry) will be the best option for you or you can even get a job and pursue B.Tech through correspondence, the choice is yours.
All the best.

Hello Shiv,
GATE entrance examination helps to get admission into government colleges in India for M.Tech. Certain jobs also demand for a valid GATE score. GATE score is also accepted by many private engineering colleges for admission into M.Tech.
GRE entrance examination helps to get admission into courses abroad. You also need to appear for TOEFL to be able to get admission into universities abroad. If you're financially good, you can opt for this option.
I hope I have been able to answer your queries. If so, kindly upvote this answer. If you've any further questions, kindly revert.

Civil engineers design, build, supervise, operate, and maintain construction projects and systems in the public and private sector, including roads, buildings, airports, tunnels, dams, bridges, and systems for water supply and sewage treatment. Many civil engineers work in design, construction, research, and education. Civil Engineering is an age old profession and with Government of India's focus on infrastructure scope and opportunities for Civil Engineer will be very high for next few years.

Please refer to the following link for list of top civil engineering colleges in India: https://www.shiksha.com/top-civil-engineering-colleges-in-india-rankingpage-53-2-0-0-0

Hi Abhinav,
If you want to get admission in IITs, then you have to score above 75% in class 12th. If you want to get admission in any government or any private college, then you have to score above 80% and have to quality for the entrance exam.
All the best.

Approximately every year 11 to 13% student all across India do B.Tech in civil engineering degree course.

Hi Rohan,
There is no short term courses on the basis of Diploma in engineering. You should have graduation with experience, then you can go for executive MBA program.
All the best.