Ipcc tax coaching

M.K.Gupta sir is best for taxation

thank Arman, yes, i know MK Gupta Classes. but some senior told me. he is good only for B.com level.he is not qualified CA or PhD or retired professor of any college. and don't have deep professional knowledge and experience of handle scrutiny cases of income tax. and i want to study tax in detail. that why i am not consider him. please inform me if this is wrong.