Hey Samruddhi,
In Bachelor in Pharmacy course, these subjects are taught to you in your 1st or 2nd Semester. These subjects that is Remedial Biology and Mathematics are taught to create a basic knowledge in you of these subjects, as their application is further used in higher semesters in the form of different subjects.
So the main aim to teach these subjects in the course is to recall the subject knowledge you have read in your Higher Secondary Education ( 11th and 12th).
This shows that the subjects are compulsory to be studied in the course, but don't worry teachers copup very nicely and the subjects only include very basic knowledge even lower than the level of 12th class.
Good luck!