Hello aspirant. I would like to tell you that you need to appear for JEE MAINS Paper 2 as it is meant for Architecture colleges only. Once you get the required rank by your desired college, you can get admission in that college. But appearing for JEE MAINS Paper is mandatory by almost all the colleges of B.Arch. I hope you found this answer helpful. Good luck. 

Hi Shaik , you can join B.arch after completing diploma in civil. You should have to score more that 60 % marks in diploma. You can go for B.arch through NATA entrance test. 

I hope it will help.

Thanks.