Some of the career options after your btech in cilvil engineering you can choose are:

• Go for M.Tech in Civil Engineering with a specialization of your choice: You gave GATE and your score is less so you can try again if interested
• Civil engineers can work in government departments, MNCs, Public Sector Units (PSUs) as well as private organisations. There are opportunities in major construction projects undertaken by central and state government agencies.

Some of the top companies that hire Civil Engineering graduates:

Jaypee Group

Gammon India Ltd.

Balaji Railroad Systems Ltd

Punj LLoyd Group,

Jaiprakash Associates

Nagarjuna Construction Company,

GMR Group

Hindustan Construction Company (HCC)

Expert Technology

Hiranandani Construction Pvt. Ltd

Godrej Properties

Prestige estates and there are many more.

You can even try for civil exams.

After some good amount of experience you can open up your own venture as well.

There are many options for you. It depends which field you are interested in.

Good luck.