MBA/PGDM

Fashion designing is entirely a separate field and is not aligned with engineering and your engineering knowledge will go waste. Fashion designing is a creative field and it takes lot of effort, luck and social status to succeed as a fashion designer. If you are sure about your passion and you only want to be a fashion designer, then you may go ahead with degree course in fashion designing from NIFT etc, else it will be better to a MBA and work in fashion industry in management filed.

There is nothing like MBA+PGDM, because, MBA is a degree given by university. PGDM is an autonomous degree given by the college. If any institute is offering MBA+PGDM, be careful with that.

Go as per your interest.
If you are interested in law, and you are hard-working and have a lot of patience, go for law.
Or, do an MBA in a reputed college and get placed.
All the best.

Some exams are GRE and GMAT. Some of the top universities are University of Toronto, University of Alberta, University of British Columbia, Mcgill University.