Many educational institutions allow post graduation course only after graduation is completed. There are integrated courses after intermediate. If the age and other eligibilities match with that of requirements, join in those colleges. But all those will be regular courses only. MBA can also be done through distance or part time mode. In our country many institutions are offering distance integrated MBA courses.
If it is not possible in that way, alternatively BBA can be done. These are advanced courses with regard to the syllabus. Some International educational institutions are conducting online MBA courses also. But it will be of help in your career if you go for MBA. In our state and Tamilnadu many institutions are offering MBA in distance mode. If you select that institution of good standard it will be of good help to some extent.