Hi , you can become a BHMS doctor by studying BHMS at undergraduate level either in private or government college . In order to get a seat it is mandatory to appear in NEET UG exam as according to the marks secured in NEET is the only way through which you will get a seat . To get eligible you  need to score a minimum of 50% which is aggregate marks of physics chemistry and biology for unreserved category and 40% for SC/ST/OBC and 45% for PWD .
Hope this helps