For b.arch aspirants is it required to write both Paper1 and Paper 2 for iit’s? And what about advanced? only AAT or both JEE Advanced and AAT?

Yes, of course both the papers have to be written, it’e either AAT or JEE advanced or NATA that a B.arch aspirant must qualify and then opt for architecture colleges/universities like –

Manipal University

Amity University

Rai University

Lovely Professional University, Phagwara-Punjab