Dear abu 

You have lots of opportunities ahead you since you have passed with good score 

Fist try to earn experience if you don't have good salary but later you will get a handsome salary

Try to prepare for government exam if you want or join any private companies 

There are lots  of companies such as bosch , alstom , askoleyland maruti etc are some of the big companies of you can get into these companies you have a bright future 

So best of luck

Mechanical is one if the evergreen branch in engineering.

There are good job opportunities for B.Tech. in Mechanical Engineering in Government as well as Private sector.

To work in Government sector, Indian Railways, DRDO, Indian Armed Forces, BHEL, PWD, NHAI, State Wise Road Transport boards etc recruits Mechanical Engineers.

There are many private sector as well who provide good job opprountities.

Good Luck!!