Degree

If you have already done Diploma in fashion design, then why do you want to go for again degree which takes again 3 to 4 years and else go for MBA or M.Sc. Design.

https://www.studying-in-germany.org/list-of-universities-in-germany/
Check this once.

Eligiblity Criteria
B.Tech Eligibility:
Min Qualification Required: 10+2
Min. Marks Required (Aggregate): 50% to 70% varies from college to college
Age Limit: Some colleges and entrance may have an age bar for aspirants who seek admission in B.Tech courses. Candidates should not be more than 24 years of age counted from the date of the examination.

Eligibility for an air hostess-training programme is plus two/or a graduate degree with a Diploma/degree in hotel management or tourism management. The aspirant must be eligible to hold an Indian Passport and should be below twenty-five years of age with a minimum height of 157.5 centimetres.
Best wishes for your career.

Radio jockeying is a talent-based field. Even though no formal educational qualification is required, a degree or at least plus two is generally a pre requisite. The most essential factor for a radio jockey is a good voice with the ability to modulate as per the occasion.

Yes, you can do Diploma in aviation from JIMS and you can do it from UPES also, these both are the best universities for aviation courses. You can apply for this course from distance learning UPES.

B.Sc has better scope than B.Com. This programme has become one of the highly studied degree courses in Indian institutions. You can pursue M.Sc after B.Sc and further get into research areas and can even look for any other job oriented professional course.

I'll suggest you IGNOU rather than going for an online programme as online universities are not reliable and trustworthy.