With your 78.9 percentile, I am mentioning a few colleges where you stand a good chance of getting selected:

• MAEER's MIT School of Management, Pune
• Rizvi Institute of Management Studies & Research, Mumbai
• Vivekanand Education Society's Institute of Management Studies & Research, Mumbai
• Shree C. E. Society's Indira Institute of Management, Pune
• Alkesh Dinesh Modi Institute for Financial & Management Studies, Mumbai
• St. Francis Institute of Management & Research, Mumbai
• Vivekanand Education Society's Institute of Management Studies & Research, Mumbai
• MAEER's M.I.T. College of Engineering, Kothrud, Pune
• Shree Chanakya Edu. Society's Indira School Of Business Studies, Tathwade
• Don Bosco Institute of Technology, Mumbai

Priyanka don't change your cast directly in the cap round without confirmation because it could create an error in your profile which could turn out to be worse because in CAP round it takes detail from the MAH-CET and matches everything you enter into the records. So, it's better you first mail on the official email address from DTE site mentioning your error and for proof attaching the OBC caste certificate. If you get an approval from their side then only enter your real caste in the CAP registration.

All the best!!