Hey Garain

Here are a few colleges you can do Mtech without GATE:

• IIIT Hyderabad PGEE
• IIIT Delhi
• IIIT Bhubaneswar

These Have their own tests:

• BITS Pilani HD
• BIT Mesra
• IPUCET, Delhi
• IIITM Kerala
• NIST Odisha
• NITTTR,
• NICMAR
• State level exams include- CUCET(for various states),TANCET(Tamil Nadu),PGCET( Karnataka), APPGECET (A.P.)
• Private college exams include- VITMEE, SRMGEET, UPES,DAIICT,COEP ,KIITEE

hope this helped

all the best