Hi,
Yes, you can surely apply for both JEE Mains paper 1 and paper 2. As paper 2 for this session has already finished, it is not possible but for the April session you can apply for it when the application window will be active. Also, paper 2 that is for B.Arch. is held on the first day only, so there won't be any clashes.
I hope this helped you.
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