hi,

GPAT score is accepted in most of the institute in india, including the  tier 1 institute. where eamcet, pgcet state wise entrance test and questions level are easier compare to Gpat. also based on students review gpat questions are a bit conceptual and you can not make correct answer just following the semester exam type questions. you have to practice the questions of previous year to gain understanding of the level of papers.

so I suggest to start preparing while you are in third year of your bachelor of pharmacy program, take a print  out of syllabus, make a separate time for gpat exam preparation apart from your college course.

hope you understand.