Design in Mumbai

https://www.shiksha.com/design/industrial-product-design/colleges/colleges-Mumbai-all
This link will guide you to your answer.

https://www.shiksha.com/design/fashion-design/colleges/jewellery-design-colleges-Mumbai-all
Hope this helps.

All the institutes are equally good. You can probably visit the campus and talk to the students there or check the website for better placement opportunity, faculty, etc. and then take your decision accordingly.

1.Shreemati Nathibai Damodar Thackersey Women's University - Churchgate
2.Rashtrasant Tukadoji Maharaj Nagpur University - RTMNU
3.Yashwantrao Chavan Maharashtra Open University
are some of the colleges

There are over 43 Interior Design colleges in Mumbai (All). Please refer to the link provided below for a detailed list consisting of these colleges. You should be able to navigate to a college and course of your choice using the filters on the web page.
Regards.
https://www.shiksha.com/design/interior-design/colleges/colleges-mumbai-all

Hi Chirag!
In Mumbai, there is Pearl Academy and Sir JJ School Of Art which are the best college for any design course. You can also explore Amity University for an interior design course.

Top Fashion Design Colleges in Mumbai are mentioned at the link provided below. This ranking is based on the college rankings published by India Today and The Week. https://www.shiksha.com/design/fashion-design/ranking/top-fashion-design-colleges-in-mumbai-all/94-2-0-10224-0.

Hi Yaowei Lam, Yes, there are Diploma courses for interior designing in Mumbai at the advanced level. I shall share names of few colleges/institutes with you for your reference. Kindly consider the other options where you can take up 3 years UG courses for interior designing. 1. International School of Design, Kandivali 2. Hue N Rig Institute of Art and Design 3. JD Institute of Fashion Technology, Vile Parle West 4. Inter National Institute of Fashion Design (INIFD Borivali) 5. Pannache International School of Design 6. International Institute of Fashion Design, Andheri Hope this will help you. Good luck.

The top most colleges include NIFT-Mumbai for fashion designing.