hi,

most common entrane test for mtech course is gate (graduate aptitude test in engineering), gate score is accepted by almost all institutions in india, there is some other exam like tancet, appgcet, lpunest etc, some institute has conducts their own entrance test. so you need to check the particular college website for details,

you may follow the below link to know colleges offers mtech in paint technology

https://engineering.careers360.com/colleges/list-of-me-mtech-in-paint-technology-colleges-in-india