Hello Nazniniti
I have not written the FPGEE yet, but i did some research and found out that lot of pharmacists who have written FPGEE recommended;
"The APhA complete review for the FPGEE"
"Lippincott pharmacology"
"Comprehensive Pharmacy Review Book"
"Management by Manan Shroff"
"Calculations by Manan Shroff"
"Theory book by Manan Shroff"
and
"1000 Q & A by Manan Shroff"
I found out that you can get them on Amazon.
Wishing you all the best.