Hello Aspirant ;

The basic and mandatory eligibility criteria for bachelor of pharmacy are as; 

• Passed from the recognized education board with Physics, chemistry as compulsory subjects along with mathematics, biology with aggregate of 50% marks or above. 
• Minimum age required not less than 17 years.  

Yes,  it's necessary to have 50% aggregate in PCB. Not in all subjects. 

Hope it helps. 

Thank you.