Hello there,

To be eligible for the IIT JEE (Joint Entrance Examination) in 2019, candidates typically need to meet certain criteria set by the conducting body, which include academic qualifications. As per the eligibility requirements for JEE Main and JEE Advanced:

1. Educational Qualification : Candidates must have completed their 10+2 or equivalent examination with Physics, Chemistry, and Mathematics as subjects.
   
   

2. Year of Appearance : If you gave your 12th improvement exams in 2019, you would still be eligible to appear for JEE 2019 as long as you meet the educational qualifications. The improvement examination allows candidates to enhance their scores from previous attempts.
   
   

3. Age Limit : There are also age criteria, usually set at a maximum age limit for the candidates, which varies slightly depending on the specific IIT or the entrance exam year.

It's essential to check the specific notification for JEE 2019 for any updates or changes in eligibility criteria. For detailed eligibility requirements and other related information, refer to the official JEE website or the National Testing Agency (NTA) guidelines for that year.

I hope this answer helps you. If you have more queries then feel free to share your questions with us we will be happy to assist you.

Thank you and wishing you all the best for your bright future.