Hello aspirant
Various entrance exams are conducted in the respected colleges for there own college admissions.
Government conducts CET exam in every state ( for eg: MHCET in Maharashtra likewise for every state)
You have to 17 year old minimum.
You must have 10+2 in science with 50% aggregate to appear for CET.
The CET score is used for further councilling.
All the best!

UPSEE exam is conducted for these courses in UP. In other states they have their own entrance exams.

There is no national level entrance for B.Pharm so the admission schedule varies college and university wise so be specific with the one you are interested in?