B.Tech

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

Dear Suman,
Not just in India, but in the entire world, you can never do engineering and medical through distance mode. So don't ask for B.Tech college in distance mode in Kolkata as you will not find and even if any college offers B.Tech in correspondence, means they are violating the rules of AICT

Dear Harshit,
Of course, you can apply provided you have to fulfill other eligibility criteria.
Best of luck.

Being a good computer engineer can get you numerous job options. Let’s start with the qualification that you have:
Software developer, software tester, network administrator, database administrator, database designer, database operator, website designer, website developer, teacher mobile, application

Hello Anuj,
Please refer the link to get more insights of the colleges and branches.
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor
However, as per your marks, you will get good colleges.