BBA and CA are 2 different courses. You can study MBA after any of the course. After BBA or CA, more precisely during the final year of BBA, you can appear for any of the MBA entrance examinations for admission to MBA. They can be CAT, CMAT, MAT, XAT, SNAP, ATMA and take admission to MBA in Hospitality Management, But for being eligible for any of these entrance examinations, you should have completed your Bachelor's degree with a minimum aggregate of 50%. It is 50% for General Category and 45% for Reserved Categories. So to be able to pursue MBA in Hospital Management, you should target atleast 50% in your Graduation