No need to worry. You can go to the respective websites of any University and there you can find eligibility criteria and you will know where you stand. Following is an example of SZABIST'S eligibility criteria for MBA, here your position is related to point number 2 (I am considering your bbs degree programme to be of 4 year duration if it is of 2 year then follow point number 3).
1. For students with a 4 year BBA degree, the MBA Program is a 1.5 years program. 10 courses and a research project (36 credits) are needed to graduate. Students are also required to complete a 6-weeks internship. Students are not required to take the SZABIST comprehensive exam.
2. For students with a 4 year professional degree (MA, MCom, BS, BE, MBBS etc), the MBA Program is a 2 to 2.5 years program. 24 courses and a research project (72 credits) are needed to graduate. Students are also required to complete a 6-weeks internship and clear the SZABIST comprehensive exam.
3. For students with a 2-3 year bachelor degree, the MBA Program is a 3-3.5 year's program. 30 courses including a research project (90 credits) are needed to graduate. Students are also required to complete a 6-weeks internship and clear the SZABIST Comprehensive exam.