.. . Is school in the oblique case here?
Yes. But स्कूल doesn't change form in the oblique case.
Problem is when one non- native engl speaker learns hindi. While it is nice and usefull to learn your engl mistakes too still i am losing points/hearts in hindi if i write raj is going in school instead to school. In my language we say IN school
My answer is correct but it is not showing
He boy is going to school
Mujhe yeh question samajh hi nahin aaya
That boy go to school