Hello Rahul ,

if you want to get a job in PSU you have to score well in GATE exam . During engineering (4th year) you can appear to this exam . it is  all india wide competition exam conducted by different IIT's  in India . For GATE 2021 IIT Bombay is conducting exam for this time 3rd year students also can write gate 2021 .

If you want some more information please got through this article you get some idea .

https://engineering.careers360.com/articles/gate

I think this answer will help you lot .

All the best !!!!!