Admission for diploma students happen through lateral entry nased in diploma aggregate scores and sonetimes entrance exam is accepted by many colleges.

List of all Mechtronics engineering cokkeges and kist of exams required below:

https://engineering.careers360.com/colleges/list-of-engineering-colleges-in-India?f%5B0%5D=sm_course_offered%3AMechatronics%20Engineering&f%5B1%5D=ss_google_city%3AMumbai