Hello , 

Hopefully you can get seat in NIT but need to clear NATA test first to take admission in B.Arch in any college. You can try for it. In the meanwhile you can also check for some Private Universities. There are some Private Universities which are equally good. They provide good Infrastructure, Faculty and Placements.You should choose a college which give you opportunity to work in live projects and give you good exposure. You may browse some web sites and check their details like Lovely Professional University, Nirma University, Noida International University etc...