Hi,

M.B.A is a two years post graduation exam. To take admission in M.B.A program a candidate need to possess bachelor degree.

Most of the institutions take admission on the basis of entrance test like cat, mat ,xat etc. Some institutions also takes interview and group discussion.

So after completing graduation  you can do mba. You need to give entrance exam that is required by the institutions. For admission to the particular college you have to follow the admission procedure of that college.

Hope this helps.