Distance/Correspondence

The course BA (Hons.) in interior design is a full-time course offered in Raffles Design International.

Yes, of course, you can. https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.shiksha.com/hospitality-travel/hotel-hospitality-management/course/amp/diploma-in-office-administration-all-india-institute-of-management-studies-mandaveli-rd-chennai-37917&ved=2ahUKEwi35vC71dLhAhXK6nMBHeTSBAcQFjAAegQIAhAB&usg=AOvVaw0Uqt2bBLErbVia5eVtKczR&cf=1
Go with the link. Regards.

You can't do a BA in 1 year and this not a legal way to get a degree. Yes, Institute of distance and open learning provides distance education mode. If you are looking for a one-year bachelor course then look for the foreign university as they offer a one-year bachelor degree. Although you shouldn't look for a one-year degree course foreign universities are the option you have. You can also look for below options also:-
1. Amity University
2. Annamalai University
3. Mewar University
4. Suresh Gyan Vihar University
5. JIMS
6. NMIMS
Regards

It is not possible (it's illegal) to go for class 12th without clearing class 11th. So, better clear your class 11th, and then think about class 12th and CS.

As you have already done M.Sc. IT, why are you interested in doing M.Tech. If you want to study further then do Ph.D. in IT or go for MBA or certifications.
All the best.

To be very honest, no. Most of the companies require full time graduates. Doing a BCA in correspondence can give you a degree but not jobs.

No, refer the following link:
https://www.shiksha.com/law/course/ll-m-school-of-law-ajeenkya-dy-patil-university-lohegaon-pune-244264