Yes, Kunal, Jharkhand State Open School is a valid one. This institution was formed with an aim to provide education as a distance learning programme for those who cannot attend school.

It is well recognised under the government of Jharkhand and the degree is accepted by the MHROD, Government of India.

So, this ia a valid one, and there are less chances for you to face any problems in future.

I hope this helps you!