B.Arch

It depends on you, If you are best in designing or arts, go for B.Arch else go for BE.

Yes, you can as NIOS is a recognized board in India.

SPA Delhi or IIT Delhi would be the best options.

You can pursue M.Arch in Urban Design, Habitat Design, Urban Planning & Project Management etc.

JEE or NATA exam scores are accepted in NIT-T for B.Arch.

Prospective applicants desirous of taking admission to first year of undergraduate course in Architecture (Bachelor of Architecture) in India take NATA. NATA scores are used by admissions authorities of different Government, Govt. Aided & unaided schools / colleges of Architecture, to provide common measure for comparing the qualifications of applicants, for admission in addition to their scholastic performance in 10+2 or equivalent examination.

You can appear for NATA exam again as according to the latest rule, you can give NATA 5 times within 2 years.

You can check the below mentioned link for details:
http://dcrustm.ac.in/admission/

University of Bombay and Indian Management School and Research Center is the best option for the same.

SPA is the best among the whole Asia. It is well known university and also known for talented architecture aspirants. If you could get admission in SPA, your future is bright.