IIT Bombay takes admission through GATE for M.tech programme.

You can check the eligibility criteria of the exam from the given below link

1- Candidates who are applying must have completed their Bachelor's degree in Engineering/ Technology or Master’s degree (M.Sc.) in any relevant science subject or must be in the final year of the programme.

2- There is no minimum pass percentage in the qualifying degree while applying for GATE

3- There is no age limit for GATE applicants.

To check the complete details you can refer below link

GATE Eligibility Criteria