Hello Aspirant,


You do not have to fill JEE mains paper 2 (B.arch) application form seperately.If you have filled JEE mains form then you can appear for B.Arch too.
Actually JEE mains conducts paper 1 (B.tech) and paper 2 (B.arch) examination at the same day.You will have to write Paper 1 (B.tech) first and at the same day you will have to write paper 2 (B.arch).
You can clear your doubt further from the link below :

https://engineering.careers360.com/articles/jee-main

I hope this helps

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