Can I get architecture in NIT if I cleared IIT mains and I and scoring above 50%in boards?

Hi Anushka
For getting NIT you board exam score  should at least 75% with compulsory as Mathematics. So you will not get NIT with these score .You can try some good college through NATA .There many good rather than nits I am providing list where you do architecture  course through NATA examination
1) School of planning and architecture Delhi
2) Sir J.J college of architecture Mumbai
3) BIT Mesra
4) RIIzvi college of architecture
5) RVCE
6)Manipal University
Hope it help out
Good luck