Ashraf, GPAT is an entrance exam for admission to M.Pharma programmes. But it is not for Ph. D. So even if you appear for GPAT, you can only try for M.Pharmacy again but not for Ph. D and so you will not get any seat for Ph.D because the exam is for M.Pharma programmes. If you want to study Ph.D and get stipend, you should opt for UGC NET.