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Hi Saptarshi,
B.Tech (Civil) and B.Arch are two entirely different courses, where in civil you get work opportunities with construction companies, with B. Arch you get same kind of field but the work you're required to do is limited with designing.
There are many similarities in the course but if you're highly creative and your designing is better then you should opt for B. Arch itself. It's a choice you have to make on the basis of your field of interest.
Meanwhile, you can apply for admissions in any of the two, the admissions are open in many universities,
Here's a link for Admission Criteria in Thapar University, Patiala, where you can learn more about your choice of course:
http://thapar.edu/index.php/civil-engineering

B.Sc Agriculture is an under-graduate course of 3 year duration which deals with the study of fundamental principles of agriculture. Bachelor of Technical Education (B.Tech) in Agriculture is a professional course of 4 years duration which deals with the study of engineering principles in agriculture. Both these graduates have an amazing career ahead not only in India but also abroad as well.
Aspirants with B.Sc Agriculture degree - main job profiles being enjoyed by them include the following:
Agriculture Technician
Rice Breeder
Agriculturists
Seed Technologist
Agriculture Specialist
Aspirants with B.Tech in Agriculture Engineering degree -
Some of the work profiles suitable for them include the following:
Agricultural Sales Engineer
Farming Consultant
Agriculture Manager
Agronomist
Researcher
So, now, you compare and choose as per your interest.