Arya, MD in Endocrinology is a 2 year Post Graduation course after MBBS. For being eligible for this course, you should have completed MBBS along with 1 year mandatory internship. And then you have to appear for NEET PF. But with BAMS, you can neither appear for NEET PG or study MD in Endocrinology. For that matter, it is not just MD in Endocrinology, any course that has MBBS as an educational qualification, you cannot pursue that course with BAMS qualification.