Pls tel me, which type of experience should i get to get the admission in MBA reputed university.,Pls tel me which comp. wil best to get exp

Actualy, I hav compltd my graduation from Pol.sci.(h) frm DU n also completed 'A' level DOEACC computer 2 yr course, now i want to do mba from reputed institute, like IIM,IIPM etc. So, before getting admission, shud i get any comp. exprnc, if yes, den which type of comp. or post shud i join.pls tel