dear sir or ma'm .i've got 56% marks in b.com. how can i get admission in any iims. what will i have to do to come at the level of iim stdnt

First of all you will have to believe in yourself that you are as capable as any other IIM student. Second based on the score you have got in B.Com you can refer the document http://www.iimahd.ernet.in/users/admission/files/Shortlist%2-Criteria_2014-16.pdf it will help you target your percentile