Hii aspirants 

Let me clear your doubt. 

The eligibility criteria for gpat exam is that a candidate should have passed class 10th and 12th examination from any recognized board to be eligible for GPAT exam.

And a candidate must be a Bachelor's degree holder in Pharmacy (4 years) to be eligible for sitting in GPAT

Candidates who are appearing for final exams of B.Pharmacy are also eligible to apply for GPAt . However, they must ensure to bring their result during GPAT counselling otherwise their registration would be cancelled. 

As you are in 3rd year you are not eligible for gpat exam. 

Good luck