The requiste academic qualifiction for GUJSET 2019 is that:

The candidates must have passed 10+2 (or equivalent) exam from Gujarat Secondary and Higher Secondary Education Board, Gandhinagar/CBSE Delhi/CISCE New Delhi/NIOS/International School Board or any other recognized board. Candidates who are appearing in their final exam in 2019 are also eligible. 

Hence, you are eligible.

Application form is now available and last date is 8th feb, 2019

Exam is on 23, april 2019

for more information: https://www.careers360.com/exams/gujcet