Hello,

You will fill 2019 as your passing year of  your intermediate. There will place in the form to fill extra details if you have have appeared any improvement exam. But the year you appear yourfirst 12th board exam  that year is your passing year of Intermediate.

Here is the link to guideline to fill  the jee application form:- https://engineering.careers360.com/articles/how-to-fill-jee-main-application-form

Go through this and read it properly before filling the form.

Hope it helps!