Hi , in order to get a seat in government college for  BHMS  then you need to appear in NEET UG exam which is conducted once a year . To get eligible for NEET you need to score minimum 50% which is aggregate marks of physics chemistry and biology alone for unreserved and 40% for SC/ST/OBC and 45% for PWD . This is just to get eligible to appear in NEET UG exam . Getting a seat in government college is all about being in merit list as it is based on marks obtained by you. So prepare well and give your best
Hope this helps