Yoga

No, it is not. It totally depends upon you.

Jivan Chakra Foundation is a globally recognised Multi-style Yoga Teacher Training School in Rishikesh, India. They offer yoga retreats and 100 hour, 200-hour teacher training programmes. Jivan Chakra foundation is a dedicated Hatha yoga school based in Ram Jhula, Rishikesh.

It will depend on the college in which you want to take admission.

For PG Diploma in Yoga Therapy, you need to be have done graduation with any stream from any recognised university.
Master of Arts in Yoga need to have minimum graduation from any stream.
However, you need to justify your gap in education.

Yes, of course. After this course, you can go for teaching. You can also self-employed by opening your own yoga center.

1. DNYS (Dipoloma in naturopathy and yogic sciences) is the first program available to anyone with +II education.
2. BNYS (Bachelors) is a multi-year program offered by a limited number of Universities.
3. So far no Indian University seems to have gone beyond BNYS.

You should have cleared 10+2 or equivalent from a recognized board of education.
Refer to link for other details: https://www.shiksha.com/beauty-fitness/yoga/course/diploma-in-yoga-deen-dayal-upadhyaya-gorakhpur-university-186691.

The course consists of theory, practical and teaching method-cum-practice teaching both. The theory papers are divided into 500 marks and consist of five subjects.
Subjects are Patanjala Yoga Sutra, Yogic Text, Yoga and Cultural Synthesis & Value Education, Anatomy and Physiology of Yogic Practices & Yogic Therapy.