If you get very good rank then there are good opportunities for you in public sector undertaking because many of the public sector companies offer job based on the rank in the gate so if you secure very good rank then apply to this companies and after giving the interviews if you are get selected then you can get the job.

The other opportunity include admission to IISC and IIT these are the top institutes for research and engineering so if you are interested for further study you can go into them.

there are many private and other government colleges which offer admission based on gate rank

All the best