Architecture

Yes, for admission to the SPA Delhi BPlan course, students are required to take an entrance test. The institute accepts JEE Main Paper-II scores for admission to UG courses, including BPlan. Thus, candidates willing to enrol into the BPlan course must appear for the JEE Main Paper-II. After appearing for the exam, they must participate in the subsequent JoSAA counselling process.

To apply for B.Arch at Aalim Muhammed Salegh Academy of Architecture you first have an eligibilty criteria that you must have passed 10th and 12th with math. You must have to quality either in NATA or JEE main paper 2. You can apply for the respective course through visiting their offical site.

The paper of session one was on January 30, and the result was declared on February 23and the paper of Session 2 was on nine April, and the result was declared on May 23, so I think the paper two results are already live, so you just can check them

With a 73 percentile in the JEE Main and belonging to the ST category, admission to NITs for B.Arch is unlikely for top-tier NITs, but there's a chance for some NITs and other good architecture colleges. You should explore other colleges and consider participating in the JoSAA/CSAB counseling process. 

To get the admission in Architecture Design, you usually require passing relevant entrance exams such as NATA or JEE main and meet the minimum eligibility criteria. You can then apply on colleges that accept these scores and participate in their related counselling or admission process.

To be eligible for admission to BArch course via UPTAC counselling, candidates must have passed class 12 or equivalent examination and obtained at least 50 percent marks in total in Physics, Chemistry & Mathematics and also at least 50 percent marks in class 12 examination.

or 

Passed 10+3 Diploma and obtained at least 50 percent marks in total.

Yes, you can do M.Arch after B.Tech in Civil, but only a few colleges allow it. Most require a B.Arch degree. If you're really interested, look for M.Arch (Environmental Planning or Urban Design) where civil grads are sometimes accepted.