I passed 12th exam in 2018 but reappearing in 2019 as private for improv % for jee what should I fill in school name ,address year of apper

When one is reappearing for the 12th for improving their score, they are not affiliated with any school. Thus, one can give the school's name where one initially did their 12th standard and its address. As for the year of appearing, since you are appearing in 2019, fill the year as 2019.

Dear Ankit,

If you are appearing in all the subjects, then the year will be 2019. However, you can check the JEE Main eligibility criteria and get an idea about the parameters which you will have to meet.

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JEE Main Eligibility Criteria 2019