Having doubt

Hi friends,
For optional papers in Mains, Is there any freedom for language selection. As I think,I am good at writing answers in English but I have read n understand most of the books of philosophy in Hindi.Now,this problem creating trouble for me n I am thinking about changing my optional.
Because If I choose Hindi then I could perfectly face essay, ethics n optional papers .But there might be a lack of confidence about remaining papers if I go for English.

I am a working professional .