BBA is a 3 years bachelor course. 

the top 5 entrance exam for BBA are:

1) CET FOR DU-BMS

2)CET FOR GGSIP-BBA

3)NMAT (UG)FOR NMIMS-BBA

4)SET GENERAL FOR SYMBOISIS BBA

5)APTITUDE TEST(AT) FOR 5-YR IPM AT IIM INDORE

ALSO. i m attaching a link in which you will get all the information like entrance eligibility, marking schemes etc.

https://bschool.careers360.com/articles/top-5-bba-entrance-exams-know-exam-pattern-eligibility-criteria-and-selection-process

have a great day!