HELLO!DARSI

To get call letter from PSU through gate score you need at least 500 score under SC/ PWDcategory.To score more than 500 score you need at least 40 marks in GATE 2019.PSU will be available with this score of around 500 are:NTPC,NPCIL,NLC etc.Cuttoff may change little bit as it depends upon total number of post and level of gate paper etc.For more details regarding gate cuttoff score for PSU visit given below site:

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

GOOD LUCK!