A Medium of Instruction Certificate (MOI) is the certificate which states the language in which you completed your degree education. It is not necessary that the instruction language is the official language of the country or state. The first language used by the student during some or all part of his schooling is the medium of instruction. It is also possible that the medium of instruction is two languages or more. If the student is well-versed or instructed in two languages or more, it is bilingual or multilingual classes respectively. According to UNESCO, “providing education in a child’s mother tongue is indeed a critical issue”.