Hello Manikanta, admission in Mtech course in VIT depends on your score in VITMEE which they conduct to take admissions of graduates for their post graduate programs. They provide specialisation in 21 courses. If you're gate qualified than you'll be given preference during the seat allotment. The cutoff of VITMEE depends on some of the factors such as,

1. Difficulty level of the paper.

2. Number of students appearing for the paper.

3. Number of seats.