Hello friend After BBA you are a Graduate now. You can explore various job opportunities i suggest after BBA you can try a part time job and then do MBA
you can gain experience that will be useful for u to get an opportunity in many companies.Entrance preparation for MBA i.e. CAT and MAT as it is the extension of what you have studied in BBA. But do opt for good institutes that accept the CAT or MAT score.However you can do job at the same time enroll yourself in MBA through distance mode like IGNOU,PTU, or from some management institute .Some institute provides Campus institute. Contact your institute Dean about this type of campus interview or placements. you to do any part-time jobs or any online part-time jobs and do your MBA. If you are poor in English communication,improve your communication,because it is very important to get good job.then do your MBA in any reputed Indian business schools.