Yes, you will be able to get admission in MBA HR if you are pursuing BBA. You will need to secure 50% marks during your graduation to be eligible for admission. You will be considered for admission in MBA on the basis of your score in CAT or MAT and your performance in GD-PI conducted by Christ. Your specialization of MBA is usually decided in the second year as in the first year you will have to study all the subjects. In the second year, core subjects are taught. Also, your major in graduation does not matter as everyone is eligible for admission considering you have secured the minimum percentage required. I would also suggest you to practice for GD-PI as your performance during these two sessions will matter and your overall score card will be decided on this basis. The competition is quite steep so make sure to give your best.