Hi Syam!

There are no measurements which could enable you to realize what rank/marks will cause you to get set in PSU's. It fluctuates from test to test, relies upon characteristics of the toppers, paper trouble level and selection of hopefuls who scores superior to you and also it will be based on number of vacancies in PSU that particular year you are appearing for GATE exam. In any case, for a definite sure determination in a PSU then you ought to be in TOP 200.

Check out this link: https://engineering.careers360.com/articles/what-are-gate-scores-for-psu-recruitment

Hope this helps!

All the best!