Is it a problem for pursuing MBA course after completing B.Arch?

You definitely can pursue an MBA after B.Arch, it depends on your interests and competencies. You need to ask your self a few questions before you make that decision. Do your core competencies lie in management? Are you sure that you want to move away from the 'design' aspects of construction towar

No, it won't give you any trouble if you have already made up your mind. You need to qualify any entrance test (such as CAT / MAT/ XAT/ NMAT/ CMAT/ GMAT/ NEST) and should also have min of 50% to 55% in your Bachelors. You can do MBA in any specializations of your interest. I am listing below some of