I am Bcom Bed teacher working in a school i teach 6th and 7 th standard but my school had asked me to do BA. they say that it is not eligibl

Yes, as upto 6th and 7th standard, there is no subject related to commerce. except Economics. You should opt for a BA in the subject like Language, History and Geography. Instead of doing a distance do a full time one and opt a college where you can complete it without leaving job. The reason is alt

I would go further to the right advice of @Govind_S and suggest that you do BA and the proceed to do B.Ed. for a btter career in your chosen field.