Hello ,

you check out this link for sample papers  of GPAT 2019 

https://pharmacy.careers360.com/articles/gpat-question-papers

here is a list of some books which you can certainly look for while preparing for gpat 

GPAT: A Companion - NN.Inamdar 

Pharmaceutics: The Science of Dosage Form Design - aulto 

Pharmaceutics: Lachman, Remington, Aulton, Ansel, Banker, Physical Pharmacy by Martin.

Pharma Analysis: Silverstein, Skoog's, Dr.Ravi shankar.

Pharmacognosy: Kokate, Trease & Evans

Pharmacology: Rang & Dale, K.D.Tripati, Goodman & Gilman.

Biochemistry: Satyanarayan.

Organic Chemistry: Morrison & Boyd

hope this help you !

all the best !