Mumbai

Hello Siddharth,
As you have not given any entrance examination, you won't get any government college and your class 12th marks are not good too. So, I recommend you to drop this year and prepare well again. Reappear for class 12th examination to score good marks and then appear for the competitive examination so that you get good government colleges.
All the best.

Hi Abdul Basit,
Here is a list of various interior designing colleges in Mumbai:
https://www.shiksha.com/design/interior-design/colleges/colleges-mumbai-all

The top colleges for pursuing MBA in Pune and Mumbai and also known for their low fee structure are JBIMS and Sydenham (both Mumbai) and PUMBA (Pune). Their tuition fees is below Rs 5 lakhs which is quite affordable as compared to the other colleges.

INIFD, Deccan provides you the complete class room training and on-job training. Every year we conduct campus interviews for the students. Regular Industrial visits and Industrial tours are arranged. Library facility is also provided, personal grooming, creative workshops, and entrepreneurship development workshop, guest lectures of industry experts, fashion show, exhibitions. Competitions are also held every year.

Hi,
Various institutes in Mumbai offer 1-year Diploma in business management:
- NMIMS
- Indian School of Business Management and Administration, Bangalore, Kalyan NagarPAID
- Welingkar

Hi,
You can refer the below link for colleges accepting MAH-CET score:
https://www.shiksha.com/mba/ranking/top-mba-colleges-in-mumbai-all-accepting-mah-cet/2-2-0-10224-9983

Hi,
Almost all of the major private colleges have lateral entry programs. I am not sure about government colleges though.
Lateral entry students join college directly in 2nd year and there is a separate admission procedure for them.