Hello swapnil following are the best colleges:

IIT, Bombay

COEP, pune 

Veer jijamata Institute 

VIT,pune

Hello Swapnil,

The top engineering colleges in Maharashtra for Mechanical Engineering:

• VJTI Mumbai
• IIT Bombay
• COEP Pune
• VNIT Nagpur
• Government College of Engineering,Aurangabad
• NMIMS Mumbai
• MIT Academy of engineering, Pune
• Walchand College of Engineering

For more information you can see our site: https://engineering.careers360.com/colleges/ranking/2016/top-engineering-colleges-in-maharashtra

Hope this information helped you!!!

Thank you