You can go in various fields.
After completing your graduation ( BTech.)
You can go for further studies: Mtech or MBA
You can go for job
You can start your business ( like startup or something).
You can go in defence through AFCAT or CDS.
You can go in government jobs or civil services.( IAS IPS IFS:  railway jobs.)etc.
You can go in research .
You can go in teaching field.
Apart from this you can go in some other fields also.
So good luck

Hello Aditya,
You can go for job through placement or you can go for preparation of GATE.
If you want to do preparation of SSC CGL, BANKING, JE, UPSC you can do what you want.
If you have good knowledge of engineering and clear all basic then try in GATE. you can join PSUs through GATE or go for M.tech if your rank is good .
Good luck.