Delhi

List of top 5 architecture colleges in Delhi-NCR according to the 2018 rankings are mentioned below:
1) School of Planning and Architecture - [SPA], New Delhi
2) Sushant School of Art and Architecture - [SSAA], Gurgaon
3) Jamia Millia Islamia University- [JMI], New Delhi
4) Vastu Kala Academy, New Delhi
5) Noida International University - [NIU], Gautam Budh Nagar
Regards.

Please refer to the link provided below for a list of all courses offered by Delhi Paramedical and Management Institute. You should be able to navigate to a course of your choice using the filters on the web page.
Regards.
https://www.shiksha.com/college/delhi-paramedical-and-management-institute-delhi-other-52607

In BVIMR admissions for MBA go till 220-230 rank. However I suggest you to sit in the counselling process.
IMED Pune is also a good option, as it has good rankings & placements.

Yes, you can apply for the KDCET for B.Tech lateral entry.

There is no such special procedural requirement. Just contact and apply in the college of your choice, fulfill their criteria and take admission.

Kolkata too has good faculties and institutions for your support. Delhi would have an advantage of being the capital city.

It is a premier place to learn English in the globally acknowledge manner. British Council, other than conducting workshops and special training offers formal courses as well:
https://www.britishcouncil.in/english/schools/Delhi
For adults:
English:
Spoken English for IELTS (Regular)
English for IELTS (Intensive)
Introduction to Creative Writing
Business Communication Skills
Cambridge CELTA
Masterclass for IELTS Trainers
For young learners:
Summer School (7 to 17 years)
Primary and Secondary (7 to 14 years)
Upper Secondary (15 to 17 years)

Hello Adarsh,
It's nice to see your dream of becoming an aeronautical engineer. Apparently this school has campus in Neemrana as well as Palam Extension. I am attaching a link that will give you all the required information. Better hurry up since entrance exam is in May. http://www.soadelhi.com/

Both cities are educational hub. It depends on your selection and other factors. All the best.