Civil Engineering

IITs are excellent institutes for B.Tech Civil Engineering studies. IIT Roorkee is the top most Institute for doing Civil Engineering. It is the Mecca for all civil engineers in India. Most of IITians are in top government and PSU positions as Civil Engineers.

A Bachelor's degree in civil engineering with a good credit average (depends upon the university) and at least above 6.5 IELTS score.
You can do Masters in Professional Engineering in Civil Engineering from Top ranked universities like University of Sydney, University of Technology Sydney, University of Melbourne(pronounced as MELBIN) etc.

The scope of mechanical is far better.

No doubt, IITs are best followed by Birla, DTU, VIT, NITs.
Check the below links-
https://www.shiksha.com/b-tech/ranking/top-civil-engineering-colleges-in-india/53-2-0-0-0
https://www.shiksha.com/b-tech/ranking/top-mechanical-engineering-colleges-in-india/48-2-0-0-0

Bits Pilani, MNIT Jaipur, NIMS University, Pratap University are providing PhD in civil engineering.

Auto cad: Revit Architecture, Surveying skills, Structural design, ETABSandSTAAD Pro, etc.

There are many institutes which provides part-time BE course for working people. You should find some colleges near you and find out the B.E program. As you have experience, so you will get edge in admission.

Hello Joy,
These days, to avoid any confusion & to have unbiased process, almost all states have started taking entrance exam for admission to any course. Direct 2nd year after diploma is no exception. Hence, if you have missed giving exam it's next to impossible to get admission.

There are several state government colleges which give lateral entry on the basis of merits. So, try your state technical university first. Other option is also available. Many private universities are providing lateral entry.