You can consider the below given criteria -
10+2 (or equivalent) examination should have been completed by the applicants from the Gujarat Secondary and Higher Secondary Education Board, Gandhinagar/ CBSE, Delhi/ CISCE, New Delhi/ NIOS/ International School Board.
If the applicants have not completed their 10+2 examination but will complete it in 2017, then these applicants will also be eligible for admission.

To know more about the GUJCET eligibility criteria, you can go through below link -

GUJCET Eligibility Criteria 2017

Good Luck!!!