Hospitality Management

Yes. They do accept it. National Institute of Open Schooling is an organisation run by central government. They have complete authority to conduct board exam and no one can question their validity. The certificates issued by NIOS is hundred percent valid. Please check the below link for Univeristies in Australia for Hospitality Management studies.
https://www.google.com/url?sa=t&source=web&rct=j&url=https://studyabroad.shiksha.com/australia/bachelors-in-hospitality-courses-sl&ved=2ahUKEwjWuoyGpdXiAhXRQ3wKHXVjChwQFjAAegQIAxAB&usg=AOvVaw0wRrUBdGSGhmijFmMgfaQc

Entrance exams are conducted for hospitality courses by many universities and colleges.
NCHMCT JEE:
Army Institute of Hotel Management& Catering Technology (AIHMCT)
Bharati Vidyapeeth Institute of Hotel Management and Catering Technology BVP CET HM) 2019. Common Hotel Admission Test by IIHM (e-CHAT)
Guru Nanak Institute of Hotel Management Joint Entrance Test GNIHM JET 2019

I would suggest go for B.Sc. Since it's offered at some of the most prominent institutes in India.

Yes, you are eligible to go for higher studies in Australia. You should complete your class 12th board first. And remember you should not have any compartment or pending backlogs. Best of luck.

Hello,
Kindly go through Shiksha link for information about hospitality management.
https://www.shiksha.com/hospitality-travel/hotel-hospitality-management/course/b-a-in-hospitality-management-iam-institute-of-hotel-management-guwahati-151509

https://www.shiksha.com/college/siitam-sun-international-institute-of-tourism-and-management-Hyderabad-Ramnagar-33259
Use the link to know about the same.
Good luck.

It would depend on the colleges you have given preference for. If the specific college has high demand then you would have to go for repeated counseling session.

Comparison to the lowest NIT, the placement cell is more active and they do recruitment process from August to June. Placement is good not only for M.Tech CS only, but also for all courses at computer Science department but the package is much good for M.Tech AI people. Good luck.