Dear aspirant,

Considering your application, in the January shift you can only give the paper 1 of the JEE mains in the Btech part only.

But you can apply for both in the April shift. After the January shift exam ends. You'll again have to register for the April shift. Only there you can choose to go with both Btech and B. Arch. . Your best of 2 for Btech will be accountable but for architecture only the April shift will be counted, as that's the only architecture exam you can give.

Hope this helps and all the best!