Hii Thakur, the cutoff varies every year based on a number of factors like test takers, vacancies, difficulty of exam etc. However as per past records, the iit chances are, 

1) IIT BHU

2) IIT Delhi - Communication engineering, Computer Technology, integrated electronic and circuit, optoelectronic and optical communication, 

3) IIT Kanpur - RF, PT 

4) IIT Madras - few courses 

5) IIT Kharagpur 

The psu chances are, 

1) AAI 

2) BSNL 

3) BEML

4) BHEL 

You can either join M.Tech or join PSU, but joining psu would be better because it is tough to get into these PSU and once inside it, it will be a good career path. But if you still have the zeal to learn, then dont leave it go waste, you have chances into top IITS. 

You can refer to the below link for detailed cutoff for various courses, various castes, various IITs 

https://engineering.careers360.com/articles/gate-cutoff-for-ee

You can refer to this link, for different psu cutoff for ee, 

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

You even have chances to get through to NITIE, where generally the cutoff is around 420-460 for ST.