For a bachelor of architecture course in IIT you must qualify JEE Main paper 1 because if you will not qualify JEE Main paper 1 then will not be eligible to appear for JEE advanced because for architecture course in IIT they does not have anything to do with JEE Main paper 2 they need to qualify JEE advanced and further then you to appear for architecture aptitude test (AAT) and those students who qualified architecture aptitude test are only able to get admission into IIT for Bachelor of architecture course

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If you are desirous of pursuing B. Arch. in IIT Kharagpur or IIT Roorkee, you must clear the Architecture Aptitude Test (AAT). The contenders who have secured a rank in JEE (Advanced) are eligible to sit for AAT. The test will be be held only at the seven zonal IITs. This means, in order to get a B. Arch course in these two institutions, one has to clear Paper 1(B. Arch. / B. Planning.) of JEE Main, JEE Advanced and AAT.

For admissions to institutions other than the IITs, JEE Main Paper 2(B. Arch. / B. Planning) scores are taken into account. Paper 2 can be attempted by pen and paper only.

Thans!!