Which college is best for robotics engineering in Maharashtra, required marks in jee to get admission to that college if I belongs to OBC.

Hello Priyanka!
Here is a list of the best engineering colleges in Maharashtra that have robotics engineering course:-
MIT College of Engineering, Pune
Mukesh Patel School of Technology, Management and Engineering, Mumbai
Rashtrasant Tukadoji Maharaj Nagpur University, Nagpur
GS Mandal's Marathwada Institute of Technology, Aurangabad
To know about the eligibility of MHT CET (the entrance for engineering colleges in Maharashtra), you can go to the following link:-
http://www.engineering.careers360.com/articles/mht-cet-eligibility-criteria

Hope this helps!
Good luck!