I will complete my BTech in IT branch,so will I get any of PSU if I get AIR 80 and perform well in GD etc
Yes, with an AIR 80 in GATE CSE/IT, I believe you have good scope in making into one of the Good PSUs with a great GD/PI.
However, I would suggest you to prepare for GATE followed by Postgraduation from some of the Higher Technical Institutes like Top IITs, NITs, BITS Pilani or IISc Bangalore for better career scope and prospects.
To know more about GATE do follow the link below