Hello Aspirant
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Firstly you should cross the cutoff marks in Jee mains b.arch exam for nits.
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Top Nits for architecture:
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NIt Bhopal
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Nit Jaipur
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Nit Patna
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Nit trichy
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To get architecture course in IIT you should be qualified in following exams.
Firstly you should be qualified in jEE mains cutoff btech exam then only you are eligible for jEE advance .if you get air India rank in that jEE advance exam then only you are eligible for AAt test ( architecture aptitude test for IITs). If you passed in AAT exam you will definitely get the seat in IITs.
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Best colleges of IITs for architecture course is:
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IIT Roorkee
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IIT Kharagpur
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If you have any questions further let me know.
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Thank you!!!!