Hii

Yes JEE Advance has two papers, Paper I and Paper II and both the papers are compulsory. You can refer to the following link for more details
https://engineering.careers360.com/articles/jee-advanced-exam-pattern

Talking about NATA,
NIT s Dont accept NATA scores for B.Arch admission. They accept admission through Joint counselling by Josaa i.e on the basis of JEE Mains B.Arch paper-2. Nata will help you to get colleges other than NIT.

Thanks!