Hey Neeraj, 

Bachelor in Pharmacy is a 4-year undergraduate degree course in medical field. The course involves study about preparing and dispensing drugs. 

The admission to this course is either based on merit in 12th examinations or on the basis of entrance exam conducted by the university or entrance exams conducted on state level like TSEAMCET, WBJEE or BITSAT (By BITS) 

Some Colleges also offer admission to the course on the basis of NEET  Exam.

So for admission to the course you just have to study good in your 12th class with concepts cleared as every entrance exam syllabus is based on 12th grade. 

Good Luck!