Hi Aspirant

There are several colleges which can be in your list .Visit the link below to know more about these colleges:

https://engineering.careers360.com/colleges/list-of-engineering-colleges-in-India?f%5B0%5D=sm_college_course_level%3APG&f%5B1%5D=sm_college_degree%3AM.E%20/Mtech.&f%5B2%5D=sm_course_offered%3AChemical%20Engineering&f%5B3%5D=sm_course_offered%3APetrochemical%20Engineering&f%5B4%5D=sm_course_offered%3APetroleum%20Engineering

There are several other entrance examination for pursuing Mtech .You can appear in that .These are:

TANCET

PGCET karnataka

PGECET

SRMJEEE PG

VITMEE

These exams will open your path to pursue M.tech without gate.

Hope this helps you.