With your percentile it's really difficult to get a chance in JBIMS Mumbai because only few seats are available for ATMA and you need to get at least 97-98 percentile (in OBC category) to get them. 

Moreover if you are targeting JBIMS only then you have this year to prepare and you can perform well in CAT or MAH CET because most of the admissions are done through these exams and only 10% seats are available for students from outside Maharashtra. 

But with your percentile you can check out these colleges 

• Department of Management Studies, University of Pune 
• IPE Hyderabad 
• SIES college of Management studies 
• Indus Business Academy 
• ITM Navi Mumbai and other colleges. 

Good luck