Hello student I'm sorry to inform you but GPAT entrance examination is not for B.pharma course its for Master's in Pharmacy.
GPAT entrance examination is a national level entrance examination for admission into Master's in Pharmacy programmes. GPAT is conducted by NTA in January every Year.
Eligibility - Candidates must hold a Bachelor degree in Pharmacy (4years after class 12). Candidates who're in their final year are also eligible.
For more updates refer to the link mentioned below - https://pharmacy.careers360.com/exams/gpat
Feel free to comment if you have any doubt