Hello aspiriant,  at 48 percentile in JEE mains you cannot get a seat in College Of Engineering Pune. For admission in COEP there is a JEE mains quota but you need a very good percentile (at least 90+) to get a seat. You should try to get admission using the MHTCET exam as most of the seats are reserved for MHTCET students and you need at least more than 200 marks to get admission in COEP.

To get detailed cutoff information for COEP visit - College of Engineering (COEP) Pune Cutoff: Check Expected & Previous Year's Cut Off Trends (careers360.com)

BEST OF LUCK!!