Yoga

Online study material might not be available but you can go for books and solved paper in the market or online purchasing of books.
All the best.

There is no guarantee for 100% placements. And, you can opt for the course, if you think you have passion for the course. As per my information, there are many student (certified Yoga trainer) who get placed in China via placements agencies are get INR. 6 Lacs package starting. So, you can go for the course if you would really like to purse it.
Companies / Recruiters who visited the campus for Placements are below.
Apollo Hospitals
NTPC
Prime Focus
Tech Mahindra
Wipro

Hi Arup,
No, you need to be a graduate in Yoga in order to pursue the post-graduation course.

The admission starts in the month of March tentatively.

Hello Subhajit, You need to check whether the university is UGC/ government approved or not? The candidates who have completed post-graduation from recognised university are allowed to apply for the exam. You can find the list of the approved universities and name of the fake universities at the official UGC Website. The candidates of distance learning are also eligible to apply for the exam. Also the candidates can choose the subject of their post-graduation to apply for UGC NET or its related subjects only.

Hi Sunita,
Kindly refer https://www.shiksha.com/humanities-social-sciences/articles/delhi-university-pg-admission-2018-list-of-courses-selection-criteria-seats-available-blogId-17035.

Yes, there is Ph.D in yoga or Physiotherapy.

Yes, you can apply for NET.