i have diploma instead of +2 after completing 10th. Whether this will create any problem in doing MBA in IIM?

Hi, In order to pursue MBA you need to be have Bachelor's Degree, with at least 50% marks or equivalent CGPA. The Bachelor's Degree or equivalent qualification obtained by the candidate must entail a minimum of three years of education after completing higher secondary schooling (10+2) or equivale

Not at all. however you need to hold a bachelors degree to get eligible for masters program.