If you want to go to the top colleges for the course of B.Arch in India then you can give the JEE MAINS paper-2 or NATA. Now if you want you can also give both the examination, but JEE MAINS paper-2 isn't necessary to give NATA. So if you want you can give only NATA and can take admission in top architecture colleges.

To know more about NATA visit the link below:

https://engineering.careers360.com/exams/nata

To know more about JEE MAINS paper 2 visit the link below:

https://news.careers360.com/jee-main-2021-paper-2-know-institutes-accepting-jee-scores-for-btech-bplanning-admission

To know more about B.Arch as a career visit the link below:

https://www.careers360.com/courses/b-arch-bachelor-of-architecture

I hope this answer helps. All the very best for your future endeavors!