Question

why did Om Prakash Valmiki had to sweep the schoolyard

Answer 1

because he was poor and he was forced by his teachers to sweep his school yard just because he was a Dalit boy.

hope this helps

Answer 2

hi friend,
Omprakash valmiki had to sweep the schoolyard because he was a dalit (Dalit is a term that the so-called lower castes use to address themselves).
Omprakash Valmiki is a famous dalit writer. Hi autobiography was ‘Joothan’.

Hope it works...