I am have done Diploma in architecture. Should I opt for B.Tech or pursue B.Tech? Can I know about JEE mains paper 2?

Since, you are a Diploma student, you can't write JEE but if you have 12th, then you can write JEE and for architecture, you need to give NATA exam. As per my knowledge, you can go with B.Tech in civil but if you want B.Arch then you need to pass NATA examination to get admission for B.Arch and it's