Hey there hope you're doing well.
Dear aspirant, if you're intended to get admissions in NITs,SPAs, and other CFTIs for b.arch. and b.plan courses then you need to only appear for JEE MAIN paper. There is no such thing that you need to appear for paper 1. But yes if you're interested in admissions into IITs for the same above courses then you need to appear in paper 1 of JEE MAIN, qualify for jee advanced then appear for AAT.
Thank you hope it helps you!

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