Part Time B.Tech

Hello Pradeep,
Surely, you can apply for part-time B.Tech after completing class 12th. Kindly refer to the link mentioned below for more information on the colleges:
https://goo.gl/l1X2Lm
Kindly filter the results based on your location preferences.
I hope this answers your question to your satisfaction

Yes, you can pursue part time B.Tech in civil engineering. But, your class 12th percentage is quite low. It might create hindrance in admission and you won't be able to get a very good college.

You need to score a minimum of 60% marks in Diploma because most of the institutes offer admission on the basis of Diploma percentage:
For college details, visit the link mentioned below:
https://engineering.shiksha.com/distance-learning-engineering-in-delhi-ncr-categorypage-2-58-1-0-0-10223-1-2-0-n

Yes, there are colleges for the same.
You can refer to the below mentioned link:
https://engineering.shiksha.com/distance-learning-civil-engineering-in-india-categorypage-2-58-631-0-0-1-1-2-none-1-0

Hi,
Lateral entry in part-time B.Tech course is not possible, you have to pursue the entire course starting from first year.

The university does not offer part time courses, you will have to go for full time course

Part-Time MBA after graduation are primarily executive courses for people with prior work-experience of at least 2-3 years. The course one should opt for, completely depends upon one's interest and area of prior experience like IT, Analytics etc.