Sir I have done 10th in 2001 from icse after that +2 in Art'sand only 2 year graduation in Art's from Ferguson college Pune for some reason
Eligibility criteria for diploma in taxation is 10 + 2 pass out so you can do diploma in taxation
Generally every student do diploma in taxation after college because in college there are chances to get basic knowledge about tax and which helps in future
Good luck for future