Benaras Hindu University is a very good university and it is one of the best universities in India.As you want to do M.Pharm in this reputed university you should have certain qualifications :
1.You should have completed your B.Pharm and you need to get 50% marks in your B.Pharm from any of one recognised universities.
2.You need to get a good score in GPAT(Graduate Pharmacy Aptitude Test) which is a national wide exam conducted.
Candidates who want to get an admission in BHU should send an application with all your details along with your percentage in B.Pharm and also GPAT scor.Those who have not cleared GPAT can write exam conducted by the university but the seats are alloted only if the seats are vaccant.
Hope this helps you.