Hi Suman, 

To get admissions in bachelors of Architecture in IITs one should obtain rank under 1000 i.e., marks above 300 and to get admissions in NITs one should obtain a rank something near about 3000 i.e marks should be more than 250. 

To get an idea abput cut-offs of different colleges please visit:

https://www.google.co.in/amp/s/engineering.careers360.com/articles/jee-main-cutoff-for-b-arch-b-planning%3famp