Hello,

To get an admission at top college like IIT/NIT/IIIT for MTech then you have to score above 85-90% of the total score so that your final score will be above 650-700.  Your rank should be below 1k. for top government college or university, score in range 400-500 is accepted. for private college, score range 350-400 is accepted.

for previous year GATE cutoff, please refer the link below:- https://engineering.careers360.com/articles/gate-cutoff

if you are looking for PSU then score above 80% will fetch good chance and make you eligible for many job option.

PSU selection is all based on your performance in graduation, GATE score and selection process. some PSU  providing organization does interviews and written test and some don't.  they have their own way.

Hope it helps!