Hello trirranga jyoti, i hope you are doing fine with your studies.

To write the gate exam the eligibity criteria you need to satisfy is that you must be a final year degree engineering or equivalent student or a graduate of bachelors and same with masters in science or its equivalent.

You can refer this link below for further information on eligibility.

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

for the placement procedure the PSUs take your gate scores for initial consideration and the rest is the weightage which could be different for a different PSU. the important factors include

• GATE score
• interview
• qualification.

all the above factors are taken into consideration to get placed in any PSU.

I hope this helps. thanks for choosing careers360.