Greetings!

Yes, you are eligible to write PGCET exam. The only criteria for eligibility is that the candidate must obtain a Bachelor's degree of minimum 3 years from a recognized University.

As you are doing a 4-year course, the criteria will be fulfilled. 

If you are from general category, you will also have to maintain your marks. A minimum aggregate score of 50% in all subjects including languages in all the years of the degree examination has to be maintained. 

Hope this helps. All the best!