Respected sir, i passed my 12th in bio-science with physics,chemistry and biology from west bengal board of higher secondary education.But now i need 12th certificate in pure-science with physics,chemistry and math for appearing in the exam of 2nd mate in merchant navy.sir can i get the certificate of 12th with physics, chemistry and mathematics from NIOS.sir suggest me the way how to get the certificate of 12th with math instead of biology, i mean phy,chem ,and math.