Masters

MBA and M.Sc. both are good courses and both have good scopes also. As you have done B.Sc. in nursing then I think you should do M.Sc. as it has more scope than MBA. After M.Sc. in nursing you can get a good job in hospitals, clinics and labs with a good salary.

If you are good at arts then you should go for any designing course. It will also help you in your post-graduation and will give you in depth knowledge.

Yes, MCA is a different course than MBA. Although you don't need MCA once you have gained degree into MBA in system or computer applications. MBA involves a mix of technology and management, so is quite recommended.

To pursue any Master’s degree, you have to get one year of work experience and a graduation degree.

You can pursue PG in fashion designing from NIFT by clearing the entrance exam of NIFT.

No, you don't need to complete PG in order to appear for UPSC exam.