Architecture

Not, possible. AICTE doesn't approve distance courses in engineering and architecture.
Regards.

Admission is done through National Aptitude Test in Architecture Exam and Entrance test. You can get admission if you qualify the Exam and fulfill minimum eligibility criteria. You can get all Requisite details in this prospectus: https://www.google.com/url?url=http://jmicoe.in/pdf18/Prospectus_2018

Level of Maths in the NATA exam is moderate and the syllabus is generally of metric level.

TANATA 2017 was conducted on August 12. TANATA 2018 exam dates are yet to be announced. There is a high likelihood that it will be held this year as well. Please refer to the link provided below for further details regarding this entrance test:
https://www.shiksha.com/university/anna-university/exams

NATA scores are used for admissions to different government aided and non-aided 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. Interested candida

Actually, your percentage in 10+2 is low. For getting admission in SRM, you need to score more than 70 percentage and you have to clear the SRMJEE Exam. But, you scored good marks in JEE Mains paper. You can contact SRM admission department, they can explain you briefly about your condition.