B.Tech Computer Science and Engineering

I think there is a mistake in your question.
Because GATE is meant for Post-Graduation courses but it can't make you to get into B.Tech
First of all, you have to complete your B.Tech to be eligible for the GATE.
But, if you want to join in B.Tech CSE in GITAM, you have to appear for GAT entrance exam conducted by GITAM University and the cut-off will be changing every year based on the number of applicants and GAT score around 300+ out of 400 can easily assure your admission into CSE even in Vizag campus.
Even if you are not able to score the cut-off don't be disappointed because later, if you contact to take admissions desk of GITAM, you can get a seat if the seats were still vacant.
All the best.

You can fill the application form for other entrance exams mentioned below. Some of the Top entrance examinations for B.Tech CSE are as follows:
JEE Main: The Joint Entrance ExamMain applications are available online in the months of December and January. Candidates can opt for either pen-paper based exam or computer-based exam for Paper 1. SRMJEEE: SRM University conducts a Joint Entrance Examination SRMJEEE for admission to B.Tech CSE. The applications are made available online in the month of February and March. MU-OET Sikkim Manipal University conducts an All India Manipal University Online Entrance Test. The Tests application forms are available in the month of March. Certain other universities rely upon State Level Entrance Test conducted by state boards for entry into engineering courses like computer sciences. These entrances and universities vary state wise across India. Regards.