Hello Rajesh !

You can give Olympiad test in MP state board.

There are several organisations that conduct Olympiad exams. However, registration for most of the Olympiad Exams takes place through Schools.

You can register yourself from the below mentioned links in the Olympiad for different exams as well as for global Olympiad :

https://www.crestolympiads.com/registration

https://www.unicusolympiads.com/registration

https://global.olympiadsuccess.com/

If you want any further information , please feel free to ask.

Hope it helps !