Diploma

The more you learn , the more you earn. So, If you have completed diploma in interior designing then going forward for professional certificate in interior styling and decoration will definitely help you in your career and job. It is always a plus point for you to have the degree from both the points.

Yes only if you have completed 10+2 and you will have to start B.Tech from first year.

This is an undergraduate course and your fees can vary between 2 Lacs to 5 Lacs but many institutes offer you this course in low fee. Its all depend on institute but if you do this course from good institute then you definitely get the top recruitment companies.

You may get the admission but not on the basis of SSC exam result you got the admission may be on your 10+2 marks.

ELIGIBILITY CRITERIA:
Candidate must have passed 10th standard or its equivalent with at least 35% aggregate marks.
Candidates passing 10th standard from Maharashtra State Board must have Maths/Mathematics (Code 71) and Science & Technology (Code 72) as compulsory subject.

Yes, N.I.B.M.S offers PG diploma in business management. For details, please refer to the link given below
https://www.shiksha.com/mba/course/pg-diploma-in-business-management-annual-nibms-borivali-east-mumbai-260754

It is a 1 year Diploma course but if opted for correspondence duration may differ.

As far as I know, this college doesn't offer diploma in ayurvedic pharmacy.

Colleges that offer 1 year Diploma in mechanical engineering in Pune:
Government Polytechnic Pune
International Institute of Management and Technical. Kohinoor Technical Institute.