Hi Achintya! The admission for JBIMS (2018-20) batch will commence after MAH CET 2018 exam, in March. MAH CET 2018 is scheduled to be held on March 10-11, 2018. MMS refers to Masters in Management Studies. It is equivalent to MBA. It is a degree programme offered by University of Mumbai. PGDM, on the other hand, is Post Graduate Diploma in Management, which is a Diploma programme and not a degree. 

JBIMS offers Masters in Marketing Management (MMM) programme, which is a specialized course. The admission at JBIMS takes place through MAH CET. The cutoff is 99+ percentile. Shortlisted candidates have to appear for the counselling rounds conducted by DTE.