Hello Mallikarjun. Thanks for contacting Careers360 and we hope we will be able to answer your query. 

Note that JEE Mains paper 1 concerns the engineering entrance exam. The Paper 2 concerns that of architecture.

If you are interested in pursuing engineering, please write JEE Mains Paper 1. If you are interested in pursuing architecture, write JEE Mains paper 2. If you are interested in both fields, you can write both the papers.

I would like to direct your attention to this link for more information:

• https://admission.aglasem.com/jee-main-exam-pattern/

Hope this helps you and all the best!