please tell me by what percent in mat/cat/cet i can join this institute

This is something, which you will have to find out. This is because, the cut off percentile will differ from year to year. You can visit the website of the institute, or get in touch with the Admissions Officer. You can however get a feel of the percentile, which the institute will be looking at, by

for CET Cut off / last candidate admitted Course 2010-11 2009-10 2008-09 MMS (FT) 115/240 89/240 113/240 PGDM (FT) 276/400 207/300 204/300 PGDM-ebiz 270/400 196/300 199/300 PGDM-BD 266/400 195/300 189/300 PGDM (Executive) (FT) 55/100 - - MMM (PT) 85