jee mains paper2 for b arch will happen on april first week of 2019 and the results will be announced till last week of may .

you can fill the form in september.

hopes it helps you

Hey.

The Commencement of Online Registration Process For January Exam for JEE MAins Paper 2 will be on September 1-30, 2018

For the April Exam it will commence on February 2nd Week 2019

The January exam will be held on 6-20 January, 2019 and the April Exam will be held on April 7-21, 2019.

Best of luck!