I am graduated in BA with 45% in 2008 . How can I take an admission for mba in maharashtra?.

for mba u habe to appear for mat and cat exam and some college prefer 45% but basic criteria for good college is 50%

I suggest that you do MBA through distance education form a UGC approved institution.

To get admission to regular MBA you will have to appear for XAT / CAT / AICTE CAT / MAT / ATMA-AIMS and score heavily. You can apply based on the scores. Your percentage seems to be low in your graduation. Please check the eligibility conditions of the institute you wish to apply.