Some of the good Junior colleges in Mumbai are:

• Anjuman Shane Islam Urdu High School and Junior College.
• Chandrabhan Sharma College of Arts, Science and Commerce.
• Lakshya Prep High School and Junior College, Powai.
• Ratnabhoomi Junior College.
• Indian Institute of Technology Bombay.
• Pace Junior Science College.
• Indra Gandhi College & Sandesh Vidyalay & Junior College.
• St Xavier's High School & Junior College.

To know more about Commerce you may visit the link provided below:

https://www.careers360.com/courses/commerce-course

I hope this answer helps. All the very best for your future endeavors!