Hindi

You need to have passed + 2 Examination with Hindi /Rashtrabasha Visharad / Rashtrabasha Praveen or equivalent.

The paper will be only in English language only.

I think no, because you have to select any one Indian Language from the Languages included in the Eighth Schedule to the Indian Constitution.

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Yes, you can do the Course of Fashion Designing in Hindi Medium also .But, there are only few colleges in India, which gives Education of Fashion Designing in Hindi Medium.

Yes, you should apply for M.Ed in any reputated college or university. You can get job as a lecturer in a school or college.

There are many languages in which one can write his UPSC exam like English, Hindi, Marathi, Tamil, Telugu, Gujarati, Kannada, etc. and many more. In all the scheduled Indian languages except for subjects like essays and English.

The entrance papers for B.Ed are both in Hindi and English at Banasthali. Refer to the link: https://www.shiksha.com/university/banasthali-vidyapith/exams/banasthali-university-aptitude-test/question-papers.

No, there is no compulsion for Hindi

No, you can opt for the same in English medium too.