Hospitality Management in Australia

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

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 Puja,
The basis difference is that Graduate Diploma courses are of 1 year while the Graduate Certificate courses are for 0.5 years. You may opt one as per your convenience and planning.
1. Southern Cross University.
2. University of Western Sydney.
3. Victoria University and
4. Blue Mountains International Hotel Management School are some of the best options.
Please check university websites for entry requirements.
Best Wishes.