Under its School of Engineering and Technology http://www.ignou.ac.in/ignou/aboutignou/school/soet/programmes/detail/575/1 , IGNOU offers 5 year Distance Education course of B.Arch. The maximum duration that you can complete this course is within 7 years. You should have completed your 12th with a minimum aggregate of 50% with Mathematics as one of the subjects at 12th. Or a 10th with 3 years Diploma with 50% aggregate is also acceptable. Those Candidates who want to take admission to B.Arch Proggramme should have a valid NATA score in the exam conducted by the Council of Architecture. The official website doesn't mention the study centres specific for course per se. But we would suggest you to reach out to the School of Engineering and Technology at: soet@ignou.ac.in